What is the name of the underwater breathing device you put in your mouth and it converts water to oxygen (this is so I don't have wear an entire scuba get up)  Does this even exist?  I saw it on James Bond and it fits right in your moouth.
217120
called a rebreather and it circulates your air and scrubbs it clean so you have air to breathe , closed loop system. its a large backpack thing and it requires special training. james bond thing is cool but non existent.
348261
We're taught to never hold our breath on ascent, no matter if it's an out of air emergency ascent situation or a normal ascent to the surface. The last breath we take in, at depth , grows in volume as we ascend. If we didn't constantly breathe with that all important exhalation, air in the aveoli (air sacs) of our lungs would grow in volume to the point they popped. You now get to drown in your own blood. \n By never holding out breath, we keep the pressure differential down to a minimum between ambient and internal.\n As for taking a deep breath before going down, it doesn't matter. We breathe at a normal rate, just like you are now and as long as we're not over exerting ourselves, that really doesn't change.\n\n Lol, diver dude, some really far out answers in there,eh?
78821
Take a quick sip of it and that air comes out when you speak.\n\nDon't try to do it a bunch of times in a row though. There's no oxygen in helium so i passed out once trying to do it for too long.
645908
You being a new diver I would recommend zero alcohol consumption if you are going to scuba dive. Either drink or dive, one or the other, but not both. ( I'm not condoning drinking one way or the other for you, just answering your question about drinking and diving).  Actually, the biggest health problem from alcohol, except for the obvious, while scuba diving is dehydration.\nI'm sure you have experienced, after a night of drinking, you wake up the next day being very thirsty.  All you want to do is drink water or some other non-alcohol drink to quench that thirst. \nSo, dehydration is a big health danger while diving, because the air you breath from your tank is compressed and very, very dry!!! This compressed dry air sucks the moisture from your body very rapidly while diving, which dehydrates you even more.  Have you ever experience a dry parched feeling throat after diving?  That is the air from your scuba tank taking the moisture from your body. I'm sure your scuba instructor told you to drink lots of water before and after diving.  That's why!!!\nSo, in my professional opinion, please do not drink if you are scuba diving, because you are so new to diving. Just don't want you to hurt yourself.\nIf you aren't going to take my advice about zero alcohol, then no more then two drinks, and then drink plenty of water. No sport drinks or Gatorade, bad for you if you're scuba diving, just water. Hope you have a great time on your vacation.....Be Safe!!!
229405
Yes... here's an article... I also found a site called dolphin gas that plans on harvesting the power of the dolphin.  Strange...\n\nhttp://www.pacificwhale.org/news/news_files/flatulence.html
287218
Can you sob underwater? No, because you can't inhale. Crying is not much of a crying is you can't sob :P
239426
Put a fish in the water and see if it dies, if it doesnt then there is oxygen in the water. If it does then shame you have to buy another fish!!!
26450
you have to know that submarine is just found in last 50 years, i guess. But the creatures in the deep ocean are actually involved to live or do activity in that kind of enviroment in few thousand years, even million years.\n\nFor example, if you bring those creatures upto few ft. deep water that could actually kill them in that pressure, even sunlight. On the other hand, just as you said, we can't go that deep because we are not belong to live in that kind of enviroment.\n\nAnd something about Oxygen, I don't sure there would have it or not, but i am sure one thing that some plants in deep ocean consume the heat and minaral near underwater volcano or "hotspring"( I don't know how to call them). So I think the fishes may consume other elements than oxygen.
145349
Yes...the baseball guy got it right. Although, there are three possible answers:\n\n---SUBMARINE---\nObviously, open the windows and the water eats you alive.\n---AIRPLANE---\nOpen the windows and the atmosphere will suck you off the airplane.\n---IN SPACE---\nWe all know that air tries to occupy everything. But the air in the ship you're riding on does not have sufficient air to occupy the whole universe. Which is why when you even dare to make a hole or open a window from your transporter, the air will travel outside so fast which could include you and get sucked out through that small hole or window. (Just like in JASON X, cool movie aint it?)
460583
Firstly i have to mention, Whilst I am certified, I'm not the most experienced diver, so I cant speak for everyone,but I think everyone dives for their own reasons, and some of us may not be all that sane :) but I can tell you why I do. It is like going to another planet, the beauty never fails to surprise and amaze. Every single dive is different and you never know what you'll see. If your want you can interact with amazing wildlife, and some of them want to play with you! As a water baby I find an awesome sense of peace by just being underwater, I cant believe that not everyone feels the same way...And the way you feel more alive just after a dive is worth all the trouble. Yes we do have to ALWAYS have to keep in mind the dangers, there are so many of them, but I think that goes hand in hand with respecting the amazing environment we are about to enter, our bodies are not built to go where it cant get its most fundamental need, air, but a lucky few of us brave it anyway.. Hopefully the dangers keep people who shouldn't be diving out of it..bad buddy experience..
620642
Under what conditions?\n\nI recall seeing an article about a hotel in the Florida Keys that has made a series of underwater "bungaloes" that guests need to SCUBA dive down to, and out of.  Looks like it would be interesting.  And there are deep-sea researchers that live at depth for some time.\n\nBut either one requires a great deal of support at this time, since none of them could be considered self-sufficient.  Perhaps in the future?
268258
I agree with the bouncy but I think Bill means that some people perceive a bouncy effect that it helps them stay up maybe 10% easier, I have noticed this effect.  Anyways here is my story i know from a bad day at diving, i didn't know the girl that well so I guess it doesn't hurt that much to write about it, and no drugs were used or anything like that but there was a POOR lack of judgment on her abilities.\n\nWe went diving with 3 friends, sally who drowned was girlfriend to Chris.  She wasn't your typical diver though, she was extremely athletic and had one of the best most perfect bodies I know, i never seen anyone fill a wetsuit like her, even used the lycra kind for the added sex appeal.  Which I think was the wrong choice for cold water and help lead to her drowning.  Anyways like I said she was more into how she looked in a wetsuit then actual diving, thinking her athletic ability would compensate for lack of experience.  We started out, all gear checked and explored in some cold water, I noticed her getting cold cause she shivered and I gave the sign to point up to go up, so all three of us went to the surface and yes she said she was cold and told her to go back to the boat and warm up and we saw her do that.\n\nChris and I went back down, but being stubborn she went back down after we left with no partner.  apparently she got confused cause we found her away from the boat quite a ways.  So chris and I come up, can't find her in the boat and panic, so we get new tanks and dive down again looking for her.  We find her with all of her equipment taken off as she tried to reach the surface quickly.  We brought her up went to a hospital but no good luck unfortunately.  Even though the water was cold it just didn't protect her.\n\nDamn I still get teary eyed reading that.
514357
I have this very object. My foolish neighbor calls it an air humidifier, like he knows anything, ( he thinks we landed on the moon, I know crazy)\n     You can borrow it, but you have to come at night. My house is the one covered in tin foil and cloaked in the star trek special edition invisibility shield, with extra force field protons.
196369
Send down a SCUBA diver to look!  Just kidding.  Your idea to pump out the well and see what happens sounds good.  If you have a camcorder, you could tie it to a rope and lower it to the bottom to have a peek like in the movie Volcano.
602400
yes, yes and NO.  Due to low concentration of oxygen in our lung blood, oxygen passes thru thin cell walls into blood.  Due to higher concentration of Carbon Dioxide in our blood, it passes into the air in our lungs and is expelled.  Each exhale has less oxygen and more carbon dioxide than the inhale breath.\n\nHowever, there is still plenty of oxygen left, not all passes into our blood.  That is why mouth to mouth resuscitation works.  Plenty of oxygen in our exhaled breath to help with someone Else's inhaled breath.
8265
A mask is all about the fit.  A perfect fit (strap not too tight, no water leaks -- pereferable even when you laugh or grin) is the only real criteria.  Any mask sold by a reputable shop would fit the bill.\n\nFins -- you need to decide between full foot and open heel.  My preference is open heel (more versatile -- especially for shore diving) although some prefer the full foot.  Fit is also hugely important and if you are shore diving in cold water buy your booties first.  My preference is the Apollo bio fins although there are many excellent choices out there.\n\nIn terms of torch, I think that depends on your application.  I like the Ikelite PCA, the UK SL4 and the small UK pocket light.  These would work for tropical night diving.  Anything brighter will overpower the reef.\n\nFor cold water or cave, you probably need to amp up the power a tad bit and I would look at the more heavy duty rechargeables (including canister lights).\n\nI remain a fan of the Suunto Cobra dive computer but there are *many* other great options.  Start with gas type (nitrox or air only), integration (not air integrated, hose air integaration and hoseless air integration), features and budget and go from there.\n\nTons of choices with regualtors -- start with your budget and diving environement.  I really like the scubapros but there are *many* great choices.  Rodale's Scuba Diving does do periodic gear reviews that are worth a look.\n\nWetsuit is alll about two things:  a) correct thickness for the water temp and your cold tolerance; and b) fit.\n\nWhat about a bc?
385334
I just use the Valsalva method; the pinch your nose and blow. Fortunately, I've not had trouble equalizing. It was so sad the weekend I did my checkout dives because there was a teenage girl there with her dad, trying to do hers, and she just couldn't equalize.  In the end, her dad did all 4 dives and finished his certification, but she only was able to do one. \n\nFrom what I've been reading, it seems that the mantra is "equalize early and often".\n\nYay for scuba diving!! (although I am sad because this has been two weekends in a row without diving for me... nobody else is willing to brave 52º water in a wetsuit!)