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Tag Archive: dive


Sidemount Technical Wreck Diving Subic Bay Philippines

Originally posted 2018-03-07 23:55:31. Pony Cylinders and Redundant Air Sources for Wreck Diving by Andy Davis Recreational wreck divers often question whether they need to carry a redundant source of air when conducting specialist wreck diving activities.  Most agencies and instructors will generally recommend the use of redundant air sources to be a prudent measure […]

Originally posted 2017-12-22 21:11:10. Technical versus Recreational Scuba Diving:  Why is there a need for Rules, Boundaries and Limitations? There is currently a strong debate about the need to differentiate between recreational and technical scuba diving. Some people believe that ‘diving is diving’ and question the need to draw a distinct boundary between recreational and […]

the balanced rig scuba diving

Originally posted 2011-08-30 17:36:52. Scuba Buoyancy Masterclass Series #8 THE BALANCED RIG by Andy Davis When considering the configuration of their scuba equipment for precision buoyancy and weighting, scuba divers should pay heed to the safety issues arising from having non-ditchable weight.  To mitigate those potential problems, it is worthwhile to devote some attention to […]

scuba diving Trim-Water-Resistance

Originally posted 2011-10-25 23:33:20. Scuba Buoyancy Masterclass Series #1 STREAMLINED SCUBA EQUIPMENT by Andy Davis, PADI TecRec, ANDI, BSAC and SSI Technical Diving Instructor Streamlined scuba equipment is a critical factor in making overall improvements to your comfort and control in the water.  Scuba divers should consider streamlined scuba kit to be a high priority […]

Breath control for scuba diving lung volume

Originally posted 2011-08-05 00:36:32. Scuba Buoyancy Masterclass #6 SCUBA BUOYANCY AND BREATHING by Andy Davis Breathing plays a critical role in scuba buoyancy control.  As we breath, the inflation and deflation of our lungs is continually affecting our buoyancy, but providing the breathing remains steady, slow and controlled it is rarely noticeable on a scuba […]

Scuba Diving Buoyancy

Originally posted 2011-08-22 16:21:53. Scuba Buoyancy Masterclass #7 ASCENT, DESCENT & BOTTOM PHASE by Andy Davis Scuba buoyancy plays an important role in all the phases of a scuba dive. In this article, we look in detail at particular elements of a scuba dive, with an emphasis on the impact of scuba buoyancy control on […]

scuba diving Weighting

Originally posted 2011-07-01 14:53:51. Scuba Buoyancy Masterclass Series #4 PERFECT SCUBA WEIGHTING by Andy Davis Divers seeking perfected scuba buoyancy can achieve precise and correct weighting through the application of several assessment methods.  As the diver progresses in experience, whenever they change equipment or whenever they change diving environments (salt/fresh water) they should re-assess their […]

Scuba Diving Philippines

Originally posted 2011-07-13 13:32:52. Scuba Buoyancy Masterclass #5 PRECISION TRIM & POSITION CONTROL by Andy Davis Whenever we use our fins for propulsion in the water, we create directional thrust. If our body is not horizontally trimmed (‘flat’) in the water, then we will be accidentally directing that thrust at an angle (upwards or downwards) […]

Scuba diving for fun and relaxation

Originally posted 2011-06-25 13:46:58. Scuba Buoyancy Masterclass Series #2 PRECISION BUOYANCY CONTROL BENEFITS by Andy Davis Let’s have a look at 7 specific reasons why effective scuba buoyancy control is critical to the scuba diver: Environmental Considerations The underwater world is a fragile environment and unintended contact from a diver is going to cause some […]

Trim-Thrust-Buoyancy scuba diving

Originally posted 2011-06-26 15:02:53. Scuba Buoyancy Masterclass ACHIEVING GREAT SCUBA BUOYANCY CONTROL by Andy Davis Scuba buoyancy control is determined by a number of different factors, such as breathing control, BCD/Drysuit inflation/deflation, weighting, trim and propulsion. As we know from our initial scuba training courses, our relative buoyancy underwater is dictated by whether the weight […]

advanced wreck diving course subic bay

Originally posted 2011-06-22 16:02:01. ADVANCED WRECK DIVING – COURSE NOTES by Andy Davis, PADI / ANDI Technical Wreck Instructor Disclaimer:   These notes accompany a professionally supervised advanced wreck diving workshop, aimed at developing specialist skills for qualified wreck divers.  This information is not a substitute for gaining proper experience under qualified direction.  Wreck penetration […]

Sidemount Diving  Technical Wreck in Subic Bay, Philippines. Just a few pics from today’s dives on the wrecks in Subic.. Diver: Andy Davis, tec instructor, Scuba Tech Philippines Photos courtesy of Jun Lao, PaparazSea Images.   Diving Logistics: Arizona Dive Center          For details about my specialist wreck diving courses, please see: […]

landing ship tank lst lsm lct

Landing Ship Tank (LST) Video – Subic Bay A nice video taken on the Landing Ship Tank, by a friend Mathew Payne when he was visiting and diving in Subic Bay. Landing Ship, Tank (LST) was the military designation for naval vessels designed during World War II to support amphibious and landing operations.   They were […]

Diving Commitment Retention Demographics Scuba Diving Industry

An Evaluation of the Modern Scuba Diving Training Industry By Andy Davis The aim of this article is to take a look at the modern scuba diving training industry and hopefully induce some debate on what’s right, and wrong, with the current state of affairs. The goal is not to empower ‘agency bashing’, which is […]

Scuba diving skills and techniques

 How to Judge Your Ascent Rate Without a Dive Computer by Andy Davis Novice divers often express frustration about how to best conduct safe and controlled ascents from their scuba dives. In particular, I see many new divers questioning the best technique for judging their ascent speed.  The common use of dive computers has automated […]

Following the start of an artificial reef construction program at Arizona Resort Dive Center, coupled with a nice long spell of dry weather, we enjoyed a few days of staff diving with a camera on the wrecks, reefs and muck diving sites of Subic Bay. Here’s a selection of the results, photos taken courtesy of  pro-photographer […]

Sidemount Technical Wreck Diving Subic Bay Philippines

How to Dive with ‘Insta-Buddies’ by Andy Davis The term ‘insta-buddy‘ is popularly used within the scuba community to define a diver of unknown skill, capability and mindset – that you are paired with on a dive boat.  Typically, this term is used to describe the worst case scenario; of a scuba dive buddy who […]

Sidemount Technical Wreck Diving Subic Bay Philippines

Choosing and Using A Redundant Air Source By Andy Davis Pony cylinders are a popular choice amongst divers who seek a redundant form of air supply as a contingency for Out-Of-Air (OOA) emergencies when scuba diving. There is a lot of debate about when, or if, a recreational open-water diver should need a redundant air […]

Wreck Diving Subic Bay Philippines

Wreck Diving Subic Bay Some snaps from this week’s wreck diving Subic Bay, Philippines. May is a perfect time to visit Subic Bay – the weather is hot, the skies are clear and the water calm and blue.  The Bay is  sheltered from rough weather and all of the wrecks are within 20 minutes travel […]

cheap quality scuba courses

Are Some Scuba Courses more Equal than Others? by Andy Davis There are some big discrepancies in course pricing for seemingly ‘identical’ scuba courses. Cheaper courses, that result in the same certification and adhere to the same minimum agency standards should all be equal…. shouldn’t they? Why shouldn’t a prospective student simply shop around for […]

Sidemount Technical Wreck Diving Subic Bay Philippines

Advanced Recreational Wreck Diving, Subic Bay, Philippines   Going beyond a standard ‘Wreck Diver’ course and exploring the full range of training and equipment available to recreational divers who seek to dive safely and confidently in a wreck environment. This video was taken during an ‘Advanced Recreational Wreck’ workshop in Subic Bay, over 4 days […]

andy davis technical diving

SCUBA Q&A: QUESTION:  I am a recreational diver and I dive mostly with my husband. Our relationship issues (bickering) caused me stress.  Is this a factor I should consider when scuba diving? Andy’s Answer: I know of at least one diving fatality that could otherwise have been avoided if intra-relationship dispute and/or the associated stress […]

M-bungee-sidemount rig

‘M Bungee’ Super-Minimalist Sidemount Rig I had some spare time the other afternoon, so I took the opportunity to test-dive a concept I’ve had brewing for a while.  Basically, it is a harness-less sidemount rig, using an ‘M’ shape continuous bungee to secure the upper wing whilst providing traditional mounting points for sidemount cylinder valves.  The wing […]

Sidemount Technical Wreck Diving Subic Bay Philippines

ANDI Ascent & Descent Procedures – Open Circuit Diving During all ANDI training courses, students are taught to follow a set system of procedures for ascent and descent.  These procedures include a number of stops, to enable team cohesion, increase safety and conservative off-gassing. You don’t need to be an ANDI trained diver to appreciate […]

Sidemount Technical Wreck Diving Subic Bay Philippines

What is Hyperbaric Oxygen Therapy (HBOT)? ANDI International Hyperbaric Research Center 74 Woodcleft Ave, Freeport NY 11520 516-546-2026 Article reproduced courtesy of Bruce Konefe  Hyperbaric is simply referencing a condition that is above standard atmospheric pressure. Instead of breathing the normal 21% oxygen, the therapy involves breathing 100% oxygen in a chamber that is moderately […]

Sidemount Technical Diving Subic Bay Philippines

Tec45 Sidemount Course – F4 Phantom (45m) Check-Out Dive By Andy Davis, PADI and ANDI technical and sidemount course instructor In June 2012, I ran a PADI Sidemount Course  in combination with the TecRec Tec40/Tec45 program, based out of Subic Bay, Philippines.  These are photos from the graduation dive – conducted on the Vietnam-era F4 Phantom supersonic fighter-bomber. […]