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I coach this all the time when I was at uni doing AAUS & now at my current employment Volunteer swim test. Short answer, don't take a full breath, ever for the 25yd UW swim. It's about CO2 tolerance and swim mechanics. Train in the pool. I guarantee your swim mechanics suck which affects your...

Hard to say without having it on the bench. If it's tuned very finely, you could tighten it down. This would increase it's cracking pressure and possibly breathing resistance depending on how the internals are made. Tweaking your Air 2 slightly in how it hangs could help too. Once you catch...

More or less with large thickness differences between gloves you would have to readjust the Goodman Handle. Ideally you would set the height so that with a slightly bent hand, your tendons would pump out and hold the Goodman handle in place. Closing your hand fully and squeezing hard, you...

If by safety you mean shattering into tiny little sharp pieces upon impact then yes! How's your disability vision insurance? :D

If I can nitpick, your original description was taken to an extreme. Blind testing you won't notice anything different. That's the main point I wanted to rebuttal with. I have heard stories of generic swivels falling apart because of an inferior screw. Omni Swivel also had this problem early on...

Answers in red, above. I'm very OCD and nitpicky. So trust me, there's hope for you and your wife.

I have to tear into this; with respect: I have the digital Bench test read outs to prove that this is absolutely false. The change is minimal enough to not be detected on Scuba Instrument's Digital Bench Test platform. If your explanation were true, Your 1st stage and 2nd stage would negate...

He has a Primary and an Air 2. No octo (ie. secondary). His backup secondary is the Air 2 (Octo-Inflator Combo). He's asking to lengthen his primary to accommodate the loss of a octo.

44in is the max length you can go universally, so I would recommend that. 40in is great, but you're still separated pretty close during an air share that UW swimming and maneuvering will make you slightly wish you had an extra inch or two. You'll want to tie a bolt snap to it with either...

Where the sunlight does not penetrate, the majority of light is created by bioluminescence, created by anything as small as plankton to as big as your large fishes. Because of this light source, eyes are specially developed to detect and perceive this. The majority of known deep sea creatures...

Reef creatures have eyes that work in relative principle to our eyes. Speculating they'll get a spot light effect, the same you and I would if you got a spot light shined in your face. But no harm from the distance we usually shine from. They are adapted to living in day and night cycles, so at...

Might be interested in the Hollis Seeker Reel; can you provide a pic? Is it the version with a bolt snap bolted in the handle or a hole for a double ender? I'm interested in the latter feature, 200ft length side handle reel. Thank you.

You should be able to feed the cam buckles (Tank straps) through the slots in the wing and they'll stay together when wrapped on a tank. To keep them together more "permanently" purchase sex bolts and screw them through the top & bottom grommet holes that line up between the wing & Harness...

Correct. Normal inflator diver is at a much lesser disadvantage diving unplugged.

Because in an ascent you're forced to vent by taking away your airsource. It is a very poor setup to choose in my opinion because of that necessity. New divers have to gain a high degree of calm and competency to pull that off. There's a large learning curve IMO. With stock BC's having the...

http://www.scubaboard.com/forums/basic-scuba-discussions/408219-practice-dumping-your-line-altair-inflator-note-divers.html Everything you need to know in the link above. Summary: - Using your right shoulder dump is by far the safest method if you're using a stock BC. - Bp/W's aren't really...

Commercial divers are required by standards to log their working dives which may be Surface Supply, SCUBA, or Hookah (under California OSHA exemptions). It has nothing to do with personal enjoyment or choice; it is part of their profession to meet working dive standards. To compare it to "it's...

It is not a loggable dive for recreational agency SCUBA for class prerequisite or class dive requirement. You're on Surface Supply pure and simple. I would still log it personally as a diver because I like that kind of paperwork, but as an Instructor I wouldn't count it.

First dive after a hiatus will do that to you. Changing environments will to; put the 2 together and it's a lot of "fun". I've had similar experiences. I did non-stop diving and training for a period of 1.5years before changing environments for a scientific field op in the Mediterranean Sea...

Let's clarify first: For a drysuit, the drysuit seal should be against your neck and the hood's neck should be layered outside the drysuit. Some drysuits have a second collar that is used to tuck the bib, some drysuits don't in which case your bib flaps out in the wind. DUI drysuits market it as...