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Hi there, since the pressure was balanced on the inside & outside of the helmet, why did it need to be made of such thick (therefore heavy) metal? any additional safety provided by the 'armor' protection of the helmet would be offset by its crushing weight,& huge buoyancy required to counter...

Hello folks, i came across a WWII training video on how to don a Mk V, all 200 lbs of it. couldnt these helmets be made of much thinner metal as they are not holding out any pressure difference, just enough metal to keep it from flexing on each breath, equivilent to a hookah that you can talk...

Hi , my zoop remained displaying 0.0m depth during the dive today :( its the first time i used it this year. battery is 3 out of 4 bars (last year it was 4/4) . It gave an accurate temperature reading throughout though. does it need further cleaning, or is this indicative of a low...

i have been going over their websites, and i didnt find pages showing housings for their new cameras. it seems they are switching to tough cameras, leaving housing production to ikelite etc, and leaving an opportunity for chinese manufacturers like meikon to gain market. why have the big...

Hi, I heard about cellphone wireless charging years ago, many models support it today. if added to a camera, you would be able to seal the case (with silicone caulk, instead of grease) and not open it again. wireless photo transfer is already common in cameras, but why are they keeping back...

Hello folks, I would like to get a new point & shoot camera with an u/w case , I was going to buy the 2013 powershot 280sx from amazon for $200, as it has everything i need, including 20x optical & manual mode for close up photography or fast fish subjects, but i read in the nick of time...

another scuba science question: in modern american/european branded regulators, is this type of failure possible? & would the reg shoot out of your mouth before any damage was done? thx b

If you've ever used a dry snorkel you will be familiar with the vacuum sensation when mid breath a wave closes the valve. My question is can it lead to negative static lung-loading Where blood plasma is drawn into the alveoli & you drown in your own plasma? Thanks

I be been leafing through the navy diving manual & have found standard treatment for AGE is o2 initially (to reduce bubble size) & chamber ( to reduce size further) . I have 3 questions about Air bubbles if you folks would be so kind : 1 Can an air bubble at chamber pressures be dissolved...

In free/skin diving I can understand why you would want a belt that you could flick open with one finger in an instant, but how did the importance of quick release get into *scuba* agency manuals? Apart from the not insignificant chance of catching the latch on something yourself & opening it...

My suunto will lock into an error mode if you are in violation of its depth instructions for decompression for more than 3 min. I presume other brand DCs also give up on you if you violate their instructions. When did this become the defacto norm? Essentially the DC is giving you an on...

Hi, I have started reading my padi adventures book to prepare for my AOW. I recall from my OW book that skills covered in the OW & confined dives were listed quite clearly. In this book its not clear which skills need to be acquired. Do you do the same skills in the AOW taster as in the...

this article mentions a diver who added breath hold deco stops during the final part of ascent for extreme free diving. But I am wondering how if is no scuba style exhalation , what sort of off gassing can occur? Thx

What's the theory behind 'bubble pumping' when breathhold diving with residual nitrogen from a scuba dive? From googling forums the common sentiment is that it is a very real danger. One way i am imagining is that breath hold diving actually helps move around nitrogen bubbles which might be...

the suunto zoop has a plan mode, which while on the boat during your surface interval you can use to input a depth and it will give you a maximum bottom time , taking the previous dive into consideration. however , the max bottom time is worked out as at that minute. I want to know how to find...

the major cost in diving for most of us are overheads which dont vary appreciably with the number of dives done in a day:air tickets/car rental,hotel accomodation/insurance/food& entertainment/gear & gear rental if nitrox can double your diving time, effectively giving you twice the bang for...

in the scene from the Big Blue, where Enzo freedives into the flooded ship to save the scuba diver, had there been an air pocket in a compartment (say 5m deep), could the freediver rest in it & breathe, obviously exhaling it in bubbles on his way up? could the scuba diver he just rescued do the...

seeing the BCD has a mouthpiece, an air exhaust and a LP air supply, could it theoretically be used as an alternate air source in an emergency,assuming say: -primary reg diaphram completely tears -octopus reg mechanism found to be seized shut -buddy no where to be seen -& am inside a wreck well...

Its me again (OW novice) .Some of the symptoms of dcs (weakness,joint pain) can easily be attributed to pre existing conditions or fatigue. How common is it for people after the dive to play down their symptoms ("I'll be ok, its nothing" ) on the boat ride back, Or the opposite for that...

everything you rent has the potential to have something residual in it, just curious, in the case of dive computers wont renting a DC that someone else just used, mean that the other persons nitrogen data will be affecting the algorithm? i myself have a zoop , & from what i understand from the...