{"id":25194,"date":"2025-01-08T12:50:53","date_gmt":"2025-01-08T04:50:53","guid":{"rendered":"https:\/\/scubatechphilippines.com\/scuba_blog\/?p=25194"},"modified":"2025-01-08T12:50:53","modified_gmt":"2025-01-08T04:50:53","slug":"gas-density-diving-research-risks-recommendations","status":"publish","type":"post","link":"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/","title":{"rendered":"Gas Density in Diving: Research, Risks &amp; Recommendations"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Gas Density in Diving: Research, Risks &amp; Recommendations<\/h1>\n\n\n\n<p>Gas density is a proven risk factor in diving, yet many divers and instructors have never heard of it. So, to resolve that lack of education, I will explain the following critical points in this article:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>What gas density is, and how it affects divers<\/li>\n\n\n\n<li>The research studies leading our understanding<\/li>\n\n\n\n<li>The risks of high mix density at depth<\/li>\n\n\n\n<li>Recommended limits for the density of breathing mix<\/li>\n\n\n\n<li>How to calculate and apply the limits <\/li>\n<\/ul>\n\n\n\n<p>Obviously, safety is paramount when diving. Make sure that you understand these issues and the recommended limits to keep yourself safe from the risks that come from them.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">Article Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#TL-DR-%E2%80%93-5-Key-Points-on-Gas-Density-in-Diving\" >TLDR &#8211; 5 Key Points on Gas Density in Diving<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#What-is-Gas-Density\" >What is Gas Density?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Defining-Gas-Density-in-Diving\" >Defining Gas Density in Diving<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Research-on-Gas-Density-in-Diving\" >Research on Gas Density in Diving<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Study-by-Simon-Mitchell-and-Gavin-Anthony\" >Study by Simon Mitchell and Gavin Anthony<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Gas-Density-and-CO2-Retention\" >Gas Density and CO2 Retention<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Density-Depth-and-Pressure\" >Density, Depth, and Pressure<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#The-Effect-of-Gas-Density-on-Divers\" >The Effect of Gas Density on Divers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Recommended-Gas-Density-Limits-For-Diving\" >Recommended Gas Density Limits For Diving<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#But-I-dont-have-problems-with-CO2-on-my-dives\" >But I don&#8217;t have problems with CO2 on my dives!?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Calculating-Gas-Density-in-Dive-Planning\" >Calculating Gas Density in Dive Planning<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Gas-Densities-at-1-ata\" >Gas Densities at 1 ata<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Gas-Density-Limits-For-Common-Diving-Mixes\" >Gas Density Limits For Common Diving Mixes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Gas-Density-in-Diving-Takeaways\" >Gas Density in Diving Takeaways<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Essential-Viewing-Simon-Mitchells-Lecture\" >Essential Viewing Simon Mitchell&#8217;s Lecture<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#References\" >References<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Further-Reading\" >Further Reading<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#About-The-Author\" >About The Author<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/gas-density-diving-research-risks-recommendations\/#Purchase-my-exclusive-diving-ebooks\" >Purchase my exclusive diving ebooks!<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"TL-DR-%E2%80%93-5-Key-Points-on-Gas-Density-in-Diving\"><\/span>TL:DR &#8211; 5 Key Points on Gas Density in Diving<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>The density of your breathing gas increases at depth.<\/li>\n\n\n\n<li>Research has shown that excessive density of breathing mixture has risks<\/li>\n\n\n\n<li>High gas density dramatically increases:\n<ul class=\"wp-block-list\">\n<li>Work of breathing (WOB)<\/li>\n\n\n\n<li>CO2 retention<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Elevated CO2 in the body causes:\n<ul class=\"wp-block-list\">\n<li>Rapidly debilitating <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/scuba-diving-co2-narcosis-and-hypercapnia\/\">CO2 narcosis<\/a><\/li>\n\n\n\n<li>Hypercapnia<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>For these reasons, DAN has recommended gas density limits that significantly reduce risks. These equate to a maximum operating depth (MOD) for a given breathing gas mixture.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<div class=\"scuba-b4-h2-2\" style=\"margin-top: 10px;margin-bottom: 10px;\" id=\"scuba-1170771547\"><div class=\"scuba-adlabel\">Sponsored Link<\/div><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-9354033900485448\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-9354033900485448\" \ndata-ad-slot=\"2393012471\" \ndata-ad-format=\"auto\" data-full-width-responsive=\"false\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What-is-Gas-Density\"><\/span>What is Gas Density?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Gas density, simply put, refers to the number of gas particles contained within a given volume. <\/p>\n\n\n\n<p>In the context of diving, this concept holds immense significance as it directly influences the behavior of the gases that divers breathe. In turn, it influences respiratory efficiency, CO2 retention, narcosis, and overall safety.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Defining-Gas-Density-in-Diving\"><\/span>Defining Gas Density in Diving<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The density of a diver&#8217;s breathing mixture is influenced by two key factors: <strong>pressure<\/strong> and <strong>temperature<\/strong>. <\/p>\n\n\n\n<p>As divers descend, the pressure around them increases. This causes gas molecules to be packed more closely together within the same volume. This heightened pressure results in an increase in gas density. <\/p>\n\n\n\n<p>Likewise, temperature variations also impact the density of breathing gas. For instance, colder temperatures cause gas molecules to contract and increase density. Conversely, warmer temperatures have the opposite effect.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Research-on-Gas-Density-in-Diving\"><\/span>Research on Gas Density in Diving<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Gas density, a once-overlooked factor in diving, has now taken the forefront of hyperbaric research, shedding light on its significant influence on divers&#8217; safety and capabilities. <\/p>\n\n\n\n<p>Recent groundbreaking work by Gavin Anthony and Simon Mitchell has provided profound insights into the role of the density of breathing mixtures in diving, reshaping our understanding of gas requirements and potential risks associated with improper gas density levels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Study-by-Simon-Mitchell-and-Gavin-Anthony\"><\/span>Study by Simon Mitchell and Gavin Anthony<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>In their paper titled &#8220;<a href=\"https:\/\/gga.kr\/wp-content\/uploads\/2019\/05\/Rebreathers-and-Scientific-Diving-Proceedings-2016-simon.pdf\"><strong>Respiratory Physiology of Rebreather Diving<\/strong>,<\/a>&#8221; Anthony and Mitchell focused on both open-circuit and rebreather divers to reveal a pivotal connection between the density of breathing gas and various physiological responses.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gas-Density-and-CO2-Retention\"><\/span>Gas Density and CO2 Retention<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>One striking finding of their research is that divers faced a critical risk of CO2 build-up when their respired gas density approached 6.0g\/L. <\/p>\n\n\n\n<p>This density threshold led to dangerous levels of CO2 retention, jeopardizing divers&#8217; safety. <\/p>\n\n\n\n<p>In <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/2288042\/\" target=\"_blank\" rel=\"noreferrer noopener\">earlier research<\/a>, by Dan Warkander and colleagues, two participants experienced a state of CO2-induced incapacitation. Importantly, these individuals exhibited this incapacitation without being conscious of the symptoms they were experiencing.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full wp-duotone-8c00b7-f7e4b1-1\"><img decoding=\"async\" width=\"800\" height=\"530\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2023\/08\/simon-mitchell-gas-density-limits-study-1.jpg\" alt=\"Gas density versus failed CO2 retention in study.\" class=\"wp-image-25214\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2023\/08\/simon-mitchell-gas-density-limits-study-1.jpg 800w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2023\/08\/simon-mitchell-gas-density-limits-study-1-300x199.jpg 300w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2023\/08\/simon-mitchell-gas-density-limits-study-1-768x509.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2023\/08\/simon-mitchell-gas-density-limits-study-1-226x150.jpg 226w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">CO2 and Gas Density Study Results. Anthony G, Mitchell S. <a href=\"https:\/\/www.omao.noaa.gov\/sites\/default\/files\/documents\/Rebreathers%20and%20Scientific%20Diving%20Proceedings%202016.pdf#page=70\" target=\"_blank\" rel=\"noreferrer noopener\">Respiratory physiology of rebreather diving<\/a>. <\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Density-Depth-and-Pressure\"><\/span>Density, Depth, and Pressure<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Diving deeper compounds the impact of gas density. For instance, the study indicated that at 4 ata (30m\/100&#8242;), exhaled gas flow and ventilation rate dropped nearly in half compared to the conditions at 1 ATA. <\/p>\n\n\n\n<p>Importantly, this depth-related effect further emphasized the necessity of managing gas density to ensure efficient respiration and gas exchange.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The-Effect-of-Gas-Density-on-Divers\"><\/span>The Effect of Gas Density on Divers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Though imperceptible to our senses, the influence of gas density is substantial. The <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/how-deep-can-you-dive-using-air\/\">effects become more impactful as depth increases<\/a>.<\/p>\n\n\n\n<p>The density of breathing gas exerts its influence through two primary avenues:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Work of breathing (WOB) <\/li>\n\n\n\n<li>Carbon dioxide (CO2) retention <\/li>\n<\/ul>\n\n\n\n<p>In turn, the accumulation of CO2 in the body can cause:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CO2 narcosis<\/li>\n\n\n\n<li>Hypercapnia<\/li>\n<\/ul>\n\n\n\n<p>These interconnected factors play a pivotal role in divers&#8217; physiological responses and safety beneath the waves.<\/p>\n\n\n\n<p><strong>Gas Density and Work of Breathing (WOB)<\/strong><\/p>\n\n\n\n<p>Gas density has a profound impact on divers&#8217; work of breathing (WOB), which refers to the effort required to breathe while submerged. <\/p>\n\n\n\n<p>An increase in the density of breathing gas intensifies WOB, necessitating greater energy expenditure for each breath. <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Elevated WOB leads to heightened CO2 production as divers use more energy for respiration.<\/li>\n\n\n\n<li>The ability to inhale fresh gas is compromised, amplifying the challenge of eliminating CO2.<\/li>\n\n\n\n<li>High WOB is <a href=\"https:\/\/journals.physiology.org\/doi\/full\/10.1152\/japplphysiol.91104.2008\" target=\"_blank\" rel=\"noreferrer noopener\">believed to be a contributing factor<\/a> to <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/immersion-pulmonary-edema-oedema-ipe-ipo\/\">Immersion Pulmonary Edema (IPE)<\/a>.<\/li>\n\n\n\n<li>Factors like regulator performance, CCR functionality, respiratory rate, and even trim position also contribute to variations in WOB.<\/li>\n<\/ul>\n\n\n\n<p><strong>Gas Density and CO2 Narcosis<\/strong><\/p>\n\n\n\n<p>The interaction between gas density and CO2 elimination holds profound implications, particularly in the realm of <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/scuba-diving-co2-narcosis-and-hypercapnia\/\">CO2 narcosis<\/a>. <\/p>\n\n\n\n<p>Elevated CO2 levels can induce symptoms known as &#8220;dark narcosis,&#8221; marked by <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/scuba-diving-anxiety-and-co2-narcosis\/\">psychological unease that may escalate to active, uncontrollable panic<\/a>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>CO2 is an internal byproduct of respiratory metabolism and is 25 times more narcotic than nitrogen.<\/li>\n\n\n\n<li>Unlike nitrogen, CO2&#8217;s rapid onset contributes to its potent narcotic effects.<\/li>\n\n\n\n<li>CO2 narcosis can manifest as scuba diving anxiety, commonly referred to as &#8220;dark narc.&#8221;<\/li>\n\n\n\n<li>Novice divers are particularly susceptible to CO2 narcosis because a weaker skillset causes more exertion.<\/li>\n\n\n\n<li><a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/diving-descent-speed-co2-narcosis-gas-density\/\">Fast descents to depth can exacerbate CO2 narcosis<\/a><\/li>\n\n\n\n<li>Differentiating between CO2 narcosis and <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/nitrogen-narcosis-sedation-consciousness\/\">nitrogen narcosis<\/a> is crucial for divers&#8217; well-being and safety.<\/li>\n\n\n\n<li>Ascending to shallower depths can alleviate CO2 narcosis by reducing partial pressures.<\/li>\n<\/ul>\n\n\n\n<p><strong>Gas Density and Hypercapnia<\/strong><\/p>\n\n\n\n<p>Excess gas density can cause <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/scuba-diving-co2-narcosis-and-hypercapnia\/\">hypercapnia<\/a>. This diving condition is characterized by excessive CO2 levels in the bloodstream due to compromised elimination. Understanding hypercapnia is paramount for maintaining a safe <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/what-is-diving-experience-diving-expertise\/\">diving experience<\/a>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hypercapnia arises when the body&#8217;s respiratory mechanisms struggle to remove CO2 effectively.<\/li>\n\n\n\n<li>Hypercapnia symptoms range from shortness of breathweight to dizziness and headache.<\/li>\n\n\n\n<li>Severe cases of hypercapnia can lead to confusion, impaired cognition, and even unconsciousness.<\/li>\n\n\n\n<li>Gas density&#8217;s role in amplifying CO2 production underscores the importance of effective respiration strategies to prevent hypercapnia.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<div class=\"scuba-b4-h2-3\" style=\"margin-top: 10px;margin-bottom: 10px;\" id=\"scuba-3783493656\"><div class=\"scuba-adlabel\">Sponsored Link<\/div><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-9354033900485448\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-9354033900485448\" \ndata-ad-slot=\"6151212517\" \ndata-ad-format=\"auto\" data-full-width-responsive=\"false\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Recommended-Gas-Density-Limits-For-Diving\"><\/span>Recommended Gas Density Limits For Diving<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>DAN Recommended Limits<\/strong><\/p>\n\n\n\n<p>Divers Alert Network (DAN) has emerged as a prominent advocate for limiting the density of breathing mix, backed by the research findings from Anthony and Mitchell. <\/p>\n\n\n\n<p><a href=\"https:\/\/dan.org\/alert-diver\/article\/performance-under-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\">DAN&#8217;s recommendations establish clear gas density limits<\/a> that align with specific diving depths. These guidelines ensure divers&#8217; well-being and provide a framework for making informed gas choices.<\/p>\n\n\n\n<p>Key points regarding DAN recommended breathing mix density limits include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>An <strong>ideal gas density of 5.2 g\/L<\/strong> is considered safe for diving.<\/li>\n\n\n\n<li>An <strong>absolute maximum limit of 6.2 g\/L<\/strong> should be used.<\/li>\n\n\n\n<li>Using air, those limits calculate as:\n<ul class=\"wp-block-list\">\n<li> <strong>Ideal max depth 31m\/102&#8242;<\/strong> <\/li>\n\n\n\n<li><strong>Absolute max depth 39m\/128&#8242;<\/strong><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Commonplace dive planning using EANx\/nitrox MOD calculation can exceed limits:\n<ul class=\"wp-block-list\">\n<li>The EANx32 MOD of 33m\/110&#8242; is&nbsp;5.6 g\/L <\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>BSAC Gas Density Limits<\/strong><\/p>\n\n\n\n<p>The British Sub-Aqua Club (BSAC) has devoted substantial efforts to determining safe breathing mixture limits for diving. Through research spanning two decades, <a href=\"https:\/\/www.bsac.com\/advice-and-support\/technical-diving\/gas-density-tables\/bsac-recommended-diving-gas-mixtures-for-open-circuit-diving\/\" target=\"_blank\" rel=\"noreferrer noopener\">BSAC has established key recommendations<\/a> that underscore the significance of adhering to a specific density of breathing gas thresholds for enhanced diving safety.<\/p>\n\n\n\n<p>Key aspects of BSAC&#8217;s gas density limits are as follows:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A recommended safe density of <strong>5.2g\/L<\/strong> or lower.<\/li>\n\n\n\n<li>Beyond <strong>6.3g\/L<\/strong>, divers face heightened risks of CO2 retention, oxygen toxicity, inert gas narcosis, <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/types-decompression-sickness-dcs\/\">decompression illness<\/a>, and immersion pulmonary edema (IPE).<\/li>\n<\/ul>\n\n\n\n<p>Specific depths with common gasses noted by BSAC include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Air at 5.1g\/L = 30m<\/li>\n\n\n\n<li>Air at 6.3g\/L = 40m<\/li>\n\n\n\n<li>36% <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/why-use-nitrox-diving-advantages-benefits\/\">EANx<\/a> at 5.2g\/L = 30m<\/li>\n\n\n\n<li>28% EANx at 6.4g\/L = 40m<\/li>\n<\/ul>\n\n\n\n<p>BSAC&#8217;s emphasis on gas density aligns with its commitment to diver safety, encouraging practitioners to make informed gas choices and plan dives that prioritize well-being.<\/p>\n\n\n\n<p><strong>Gas Density Limits and Technical END Limits<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/what-is-technical-diving\/\">Technical diving<\/a> training agencies like GUE and RAID recognize the importance of the density of breathing gas.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Integration of Gas Density<\/strong>: GUE and RAID incorporate recommendations on breathing mix density into their training standards, employing trimix maximum Equivalent Narcotic Depth (END) limits to ensure diver safety.<\/li>\n\n\n\n<li><strong>Maintaining Maximum END<\/strong>: Both GUE and RAID adhere to a <em>maximum END of 30m\/100&#8242;<\/em>, to mitigate both <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/nitrogen-narcosis-sedation-consciousness\/\">inert gas narcosis<\/a> and density of breathing gas concerns.<\/li>\n\n\n\n<li><strong>RAID&#8217;s <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/deep-diver-courses\/\">Recreational Deep Diver<\/a> Option<\/strong>: RAID goes a step further by <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/why-do-deep-divers-use-helium\/\">introducing helitrox\/trimix<\/a> as an option within their recreational Deep Diver training program, offering divers an additional tool to stay within recommended limits.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"But-I-dont-have-problems-with-CO2-on-my-dives\"><\/span>But I don&#8217;t have problems with CO2 on my dives!?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>I am sure many divers will read this article who already have experience diving beyond the recommended density limits. In general, they won&#8217;t have observed significantly debilitating effects from CO2 retention and work of breathing. Understandably, it can be tempting to dismiss the dive safety advice.<\/p>\n\n\n\n<p>However, do remember that respiratory demand increases enormously in an emergency. Under <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/scuba-diving-stress-management-and-diver-panic\/\">stress<\/a> and physical workload, the addition of a high density of breathing gas can lead to rapid, catastrophic spikes in CO2 retention.<\/p>\n\n\n\n<p>A sudden CO2 narcosis hit in the middle of dealing with a crisis underwater can make the difference between success and failure. As such, the density of your gas can be the factor that decides whether you survive, or not. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Calculating-Gas-Density-in-Dive-Planning\"><\/span>Calculating Gas Density in Dive Planning<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The easiest way to calculate the density of breathing gas is to use this downloadable tool:&nbsp;<a href=\"https:\/\/drive.google.com\/a\/gue.com\/file\/d\/1AWCqII4lmexbC-zsN4-_56DVg06Wm31S\/view?usp=sharing\" target=\"_blank\" rel=\"noreferrer noopener\">simple gas density calculator<\/a>&nbsp;from Brendon Allen. <\/p>\n\n\n\n<p>The tool enables you to calculate your gas mix&#8217;s density at the maximum planned depth (in ATA). It also includes equivalent narcotic depth (END), and <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/scuba-gas-laws-for-diving-physics\/\">partial pressure<\/a> of oxygen (PPO2) at the planned max depth.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gas-Densities-at-1-ata\"><\/span>Gas Densities at 1 ata<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>It is important to understand that the constituent gasses within diving mixes influence the overall density of your breathing gas.<\/p>\n\n\n\n<figure class=\"wp-block-table aligncenter is-style-stripes\"><table class=\"has-border-color has-palette-color-4-border-color\" style=\"border-width:1px\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Gas at 1 ata<\/th><th class=\"has-text-align-center\" data-align=\"center\">Density (g\/L)<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Helium<\/td><td class=\"has-text-align-center\" data-align=\"center\">0.179<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Nitrogen<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.251<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Oxygen<\/td><td class=\"has-text-align-center\" data-align=\"center\">1.428<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gas-Density-Limits-For-Common-Diving-Mixes\"><\/span>Gas Density Limits For Common Diving Mixes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The table below shows how gas density limits are easily exceeded if calculating dive maximum operating depth (MOD) solely from PPO2.<\/p>\n\n\n\n<figure class=\"wp-block-table aligncenter is-style-stripes\"><table class=\"has-border-color has-palette-color-4-border-color has-fixed-layout mtr-table mtr-thead-th\" style=\"border-width:1px\"><thead><tr><th class=\"has-text-align-center mtr-th-tag\" data-align=\"center\" data-mtr-content=\"Gas\"><div class=\"mtr-cell-content\">Gas<\/div><\/th><th class=\"has-text-align-center mtr-th-tag\" data-align=\"center\" data-mtr-content=\"1 ata Density\"><div class=\"mtr-cell-content\">1 ata Density<\/div><\/th><th class=\"has-text-align-center mtr-th-tag\" data-align=\"center\" data-mtr-content=\"Ideal Max at 5.2g\/L\"><div class=\"mtr-cell-content\">Ideal Max at 5.2g\/L<\/div><\/th><th class=\"has-text-align-center mtr-th-tag\" data-align=\"center\" data-mtr-content=\"Hard Max 6.2g\/L\"><div class=\"mtr-cell-content\">Hard Max 6.2g\/L<\/div><\/th><th class=\"has-text-align-center mtr-th-tag\" data-align=\"center\" data-mtr-content=\"1.4 PPo2 MOD\"><div class=\"mtr-cell-content\">1.4 PPo2 MOD<\/div><\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Gas\"><div class=\"mtr-cell-content\">Air<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"1 ata Density\"><div class=\"mtr-cell-content\">1.293<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Ideal Max at 5.2g\/L\"><div class=\"mtr-cell-content\">30.4m<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Hard Max 6.2g\/L\"><div class=\"mtr-cell-content\">38.1m<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"1.4 PPo2 MOD\"><div class=\"mtr-cell-content\">56m<\/div><\/td><\/tr><tr><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Gas\"><div class=\"mtr-cell-content\">EANx28<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"1 ata Density\"><div class=\"mtr-cell-content\">1.3<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Ideal Max at 5.2g\/L\"><div class=\"mtr-cell-content\">30m<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Hard Max 6.2g\/L\"><div class=\"mtr-cell-content\">37.7m<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"1.4 PPo2 MOD\"><div class=\"mtr-cell-content\">40m<\/div><\/td><\/tr><tr><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Gas\"><div class=\"mtr-cell-content\">EANx32<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"1 ata Density\"><div class=\"mtr-cell-content\">1.31<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Ideal Max at 5.2g\/L\"><div class=\"mtr-cell-content\">29.8m<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Hard Max 6.2g\/L\"><div class=\"mtr-cell-content\">37.4m<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"1.4 PPo2 MOD\"><div class=\"mtr-cell-content\">33.7m<\/div><\/td><\/tr><tr><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Gas\"><div class=\"mtr-cell-content\">EANx36<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"1 ata Density\"><div class=\"mtr-cell-content\">1.31<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Ideal Max at 5.2g\/L\"><div class=\"mtr-cell-content\">29.6m<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"Hard Max 6.2g\/L\"><div class=\"mtr-cell-content\">37.2m<\/div><\/td><td class=\"has-text-align-center mtr-td-tag\" data-align=\"center\" data-mtr-content=\"1.4 PPo2 MOD\"><div class=\"mtr-cell-content\">28m<\/div><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<div class=\"scuba-b4-h2-4\" style=\"margin-top: 10px;margin-bottom: 10px;\" id=\"scuba-3875950043\"><div class=\"scuba-adlabel\">Sponsored Link<\/div><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-9354033900485448\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-9354033900485448\" \ndata-ad-slot=\"2954736365\" \ndata-ad-format=\"auto\" data-full-width-responsive=\"false\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gas-Density-in-Diving-Takeaways\"><\/span>Gas Density in Diving Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In conclusion, you should try to incorporate considerations of gas density when planning and conducting your dives:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>On descend, the density of your breathing gas increases.<\/li>\n\n\n\n<li>Extensive research has highlighted the potential risks associated with excessive density of breathing gas, underlining the importance of understanding and managing this aspect.<\/li>\n<\/ul>\n\n\n\n<p>A high density of breathing gas has been found to lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Increased work of breathing (WOB), potentially affecting divers&#8217; performance and endurance.<\/li>\n\n\n\n<li>Enhanced CO2 retention, contributing to the risk of CO2 narcosis and hypercapnia.<\/li>\n<\/ul>\n\n\n\n<p>Start applying the Divers Alert Network (DAN) recommended limits in your dive planning:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ideal limit &#8211; 5.2g\/L<\/li>\n\n\n\n<li>Absolute limit &#8211; 6.2g\/L<\/li>\n<\/ul>\n\n\n\n<p>These limits correspond to a maximum operating depth (MOD) for specific breathing gas mixtures, offering divers a clear guideline for safer underwater exploration.<\/p>\n\n\n\n<p>Ideally, use the gas density calculator, linked earlier in this article, to establish the deepest safe depth for your specific diving mix.<\/p>\n\n\n\n<p>Finally, by acknowledging the risks of gas density and adhering to recommended guidelines, divers can minimize risks and ensure their underwater experiences remain both exhilarating and secure.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Essential-Viewing-Simon-Mitchells-Lecture\"><\/span>Essential Viewing: Simon Mitchell&#8217;s Lecture<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>This lecture by Simon Mitchell outlines the research done on gas density and how that led to limits being recommended.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"RESPIRATORY FAILURE IN TECHNICAL DIVING\" width=\"1290\" height=\"968\" src=\"https:\/\/www.youtube.com\/embed\/QBajM3xmOtc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"References\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Anthony G, Mitchell S. <a href=\"https:\/\/www.omao.noaa.gov\/sites\/default\/files\/documents\/Rebreathers%20and%20Scientific%20Diving%20Proceedings%202016.pdf#page=70\" target=\"_blank\" rel=\"noreferrer noopener\">Respiratory physiology of rebreather diving<\/a>. In: Pollock NW, Sellers SH, Godfrey JM, eds. Rebreathers and Scientific Diving. Proceedings of NPS\/NOAA\/DAN\/AAUS June 16-19, 2015, Workshop. Durham, NC; 2016; 66-79.<\/li>\n\n\n\n<li>Warkander DE, Norfleet WT, Nagasawa GK, Lundgren CEG. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/2288042\/\" target=\"_blank\" rel=\"noreferrer noopener\">CO2 retention with minimal symptoms but severe dysfunction during wet simulated dives to 6.8 ATA abs<\/a>. Undersea Biomed. Res. 1990; 17(6):515-523.<\/li>\n\n\n\n<li>Lambertsen CJ, Gelfand R, Lever MJ, Bodammer G, Takano N, Reed TA, et al. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/4716936\/\" target=\"_blank\" rel=\"noreferrer noopener\">Respiration and gas exchange during a 14-day continuous exposure to 5.2% O2 in N2 at pressure equivalent to 100 FSW (4 ATA)<\/a>. Aerosp. Med. 1973; 44:844-849.<\/li>\n\n\n\n<li>Doolette DJ, Mitchell SJ. <a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/23737169\/\" target=\"_blank\" rel=\"noreferrer noopener\">Hyperbaric conditions<\/a>. Comprehensive Physiol. 2011; 1:163-201.<\/li>\n\n\n\n<li>Moon, R. E., Cherry, A. D., Stolp, B. W., &amp; Camporesi, E. M. (2009). <a href=\"https:\/\/journals.physiology.org\/doi\/full\/10.1152\/japplphysiol.91104.2008\" target=\"_blank\" rel=\"noreferrer noopener\">Pulmonary gas exchange in diving<\/a>. <em>Journal of Applied Physiology<\/em>. https:\/\/doi.org\/JAPPL-91104-2008<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Further-Reading\"><\/span>Further Reading<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/dan.org\/alert-diver\/article\/performance-under-pressure\/\" target=\"_blank\" rel=\"noreferrer noopener\">Performance Under Pressure<\/a>, by Reilly Fogarty, DAN, 2019 <\/p>\n\n\n\n<p><a href=\"https:\/\/gue.com\/blog\/density-discords-understanding-and-applying-gas-density-research\/\" target=\"_blank\" rel=\"noreferrer noopener\">Density Discords: Understanding and Applying Gas Density Research<\/a>, by Reilly Fogarty, InDepth, 2019<\/p>\n\n\n\n<p><a href=\"https:\/\/www.ddrc.org\/gas-density-and-scuba\/\" target=\"_blank\" rel=\"noreferrer noopener\">Gas Density and Scuba<\/a>, Diving Disease Research Center (DDRC), 2023<\/p>\n\n\n\n<p><a href=\"https:\/\/www.bsac.com\/advice-and-support\/technical-diving\/gas-density-tables\/bsac-recommended-diving-gas-mixtures-for-open-circuit-diving\/\" target=\"_blank\" rel=\"noreferrer noopener\">BSAC recommended diving gas mixtures for open circuit diving<\/a>, BSAC website, 2020<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n\n\n\n<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-content-justification-center is-layout-constrained wp-block-column-is-layout-constrained\" style=\"flex-basis:25%\">\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-medium is-resized is-style-default\"><a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/andy-davis-technical-diving\/\"><img decoding=\"async\" width=\"300\" height=\"296\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1-300x296.png\" alt=\"Andy Davis Technical Sidemount Wreck Diving Subic Bay Philippines RAID Courses Training\" class=\"wp-image-6812\" style=\"width:225px;height:222px\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1-300x296.png 300w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1-1024x1009.png 1024w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1-768x757.png 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2018\/03\/Cartoon-Andy-900x900-1.png 1280w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-constrained wp-block-column-is-layout-constrained\" style=\"flex-basis:75%\">\n<h2 class=\"wp-block-heading has-text-align-center\"><span class=\"ez-toc-section\" id=\"About-The-Author\"><\/span>About The Author<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"274\" height=\"77\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2022\/12\/bmc-button-1-1.png\" alt=\"\" class=\"wp-image-27046\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2022\/12\/bmc-button-1-1.png 274w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2022\/12\/bmc-button-1-1-250x70.png 250w\" sizes=\"(max-width: 274px) 100vw, 274px\" \/><\/a><\/figure>\n\n\n\n<p><a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/andy-davis-technical-diving\/\">Andy Davis<\/a> is a <a href=\"https:\/\/scubatechphilippines.com\/raid-diving-courses-philippines\/raid\/\">RAID<\/a>, PADI TecRec, ANDI, BSAC, and SSI-qualified independent technical diving instructor who specializes in teaching <a href=\"https:\/\/scubatechphilippines.com\/sidemount-courses\/\">sidemount<\/a>, <a href=\"https:\/\/scubatechphilippines.com\/technical-diving-courses\/\">trimix<\/a>, and <a href=\"https:\/\/scubatechphilippines.com\/technical-diving-courses\/\">advanced wreck<\/a> diving courses.<\/p>\n<\/div>\n<\/div>\n\n\n\n<p>Currently residing in <a href=\"https:\/\/scubatechphilippines.com\/scuba_blog\/subic-bay-wreck-diving-sites\/\">Subic Bay, Philippines<\/a>; he has amassed more than 10,000 open-circuit and CCR dives over three decades of challenging diving across the globe.<\/p>\n\n\n\n<p>Andy has published numerous diving magazine articles and designed advanced certification courses for several dive training agencies, He regularly tests and reviews new dive gear for scuba equipment manufacturers. Andy is currently writing a series of <a href=\"https:\/\/www.buymeacoffee.com\/andydavistech\/extras\">advanced diving books <\/a>and creating a range of <a href=\"https:\/\/www.redbubble.com\/people\/andydavistech\/shop\">tech diving clothing and accessories<\/a>.<\/p>\n\n\n\n<p>Prior to becoming a professional technical diving educator in 2006, Andy was a commissioned officer in the Royal Air Force and has served in Iraq, Afghanistan, Belize, and Cyprus.<\/p>\n\n\n\n<p>In 2023, Andy was named in the &#8220;<a rel=\"noreferrer noopener\" href=\"https:\/\/gue.com\/blog\/sidemount-andy-davies\/\" target=\"_blank\">Who&#8217;s Who of Sidemount<\/a>&#8221; list by GUE InDepth Magazine.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-palette-color-7-color has-vivid-red-background-color has-text-color has-background has-link-color wp-elements-dd81a6de961563c5bf17302e4376cbd2\"><span class=\"ez-toc-section\" id=\"Purchase-my-exclusive-diving-ebooks\"><\/span>Purchase my exclusive diving ebooks!<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div class=\"wp-block-columns is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/233191\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-652x1024.jpg\" alt=\"Gas Management For Scuba Divers Book\" class=\"wp-image-26264\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image-96x150.jpg 96w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/03\/Gas-Management-Book-Cover-Image.jpg 794w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/233171\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-652x1024.jpg\" alt=\"Become A Shearwater Power User Book\" class=\"wp-image-26382\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-978x1536.jpg 978w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook-95x150.jpg 95w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/Shearwater-Gradient-Factors-ebook.jpg 1200w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/111242\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-652x1024.jpg\" alt=\"\" class=\"wp-image-26656\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE-96x150.jpg 96w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/COVER-IMAGE.jpg 794w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-not-stacked-on-mobile is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/262907\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-652x1024.jpg\" alt=\"A Comprehensive Guide to Backplate &amp; Wing BCDs\" class=\"wp-image-26808\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image-96x150.jpg 96w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/07\/BPW-Book-Cover-Image.jpg 794w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/buymeacoffee.com\/andydavistech\/e\/260377\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" width=\"652\" height=\"1024\" src=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-652x1024.jpg\" alt=\"Diving Psychology The Path to Proficiency: Mental Strategies for Scuba Divers (eBook)\" class=\"wp-image-26633\" srcset=\"https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-652x1024.jpg 652w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-191x300.jpg 191w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-768x1206.jpg 768w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image-96x150.jpg 96w, https:\/\/scubatechphilippines.com\/scuba_blog\/wp-content\/uploads\/2024\/05\/The-Path-To-Proficiency-Book-Cover-Image.jpg 794w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-dots\"\/>\n<p id=\"rop\"><small>Originally posted 2023-08-20 15:38:01. <\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>Discover how gas density influences diving safety. Learn about the latest research, risks to divers, &#038; recommended limits for safe dives!<\/p>\n","protected":false},"author":2,"featured_media":25226,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1825],"tags":[2101,2102,2104,2100,2103],"class_list":["post-25194","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-scuba-diving-safety","tag-dan-gas-density-recommendations","tag-gas-density-and-co2-retention","tag-gas-density-in-dive-planning","tag-gas-density-limits","tag-the-dangers-of-high-gas-density-when-diving"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gas Density in Diving: Research, Risks &amp; Depth Recommendations<\/title>\n<meta name=\"description\" content=\"Discover how gas density influences diving safety. 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