How much does the thing that helps you to breath underwater cost?
374822
Probaly about $50 bucks or so cause i have one and mine cost about that much.
591718
NASA is offering aerogel for $10-$15 try you can find on google search
311098
Not very much.  The water pressure on your body would prevent you from being able to bring in air that is at normal atmospheric pressure.  You need a compressor on the surface and a hose to breath from.
901093
Your local dive shop will have either someone on staff or someone they can send it out to. Now is the time to add any upgrades to it, like a pee valve or better boots etc.
395427
Your heartrate will slow down as you keep holding your breath. Once you start breathing again, it will increase to above normal for a while and then settle back to normal.\n\n(Assuming you are not exerting additional force, such as swimming underwater)
499509
As in underwater?\nLike an underwater city?\nAn air tank\na wet suit\nfreeze dried food\ndrinkable water\na sub. of some sort for travel.
613079
Chew gum!  It works for me everytime.  Or try doing it underwater!
438161
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.
722598
This is one you have to be careful with. \n\nThe actual world record on a single breath underwater static apnea(unassisted)is 8min 58sec held by German freediver Tom Sietas. \n\nThis was the record David Blaine was going for but hell 7 mins is damn impressive! Especially in his condition.\n\nYou can read of record breaking times that exceed 15mins, however these records were only achieved by pre-breathing 100% oxygen and are not recognised by virtually all the freediving community (including AIDA - the largest international body).
746672
It could be from $20 to about $50. depending on your health, smarts, looks etc.
1183144
By free diving, I assume you're referring to diving w/o SCUBA, or air supplied from the surface. A person who is preparing to swim under water may deliberately hyperventilate (deeply inhaling and exhaling) before taking a deep breath and submerging in an attempt to be able to stay under water longer. That desperate urge to breathe, to the best of my knowledge, is triggered by increased CO2 levels in the body, not by a lack of oxygen; and since hyperventilating reduces the CO2 level in the blood, the diver's urge to breathe is reduced. A serious problem can occur if the oxygen level in the diver's brain drops so low that the  diver blacks out underwater because he did not realize he needed air. If that happens, I can't see why a person woudn't run the risk of swallowing water.\n      In such a case, it seems reasonable that perhaps you'd treat them like any other near drowning victim, but since I'm not medical personnel, I wouldn't even begin to offer any advice. You may well want to ask your doctor about what to do or where to go for advice on this matter.
733275
I spent a total about $2000 for mine but like mentioned earlier it can be a lot less and a whole lot more. Then again I have many duplicates such as 3 masks, multiple snorkles, top of line fins. I sometimes shop at Diver's Outlet (Divers Direct online)shop in Orlando, Florida or at other time from their website. Another that I hear a lot about is Leisure Pro. Both shops have a HUGE assortment of equipment and will sell a whole diving set. Diversdirect also does dive travel bookings.\n\nhttp://www.diversdirect.com/ \nhttp://www.leisurepro.com/prod/RSASPT.html
580179
Havent you heard of SCUBA gear????
468337
there are some chmicals you can buy for cheap but the free way is to spit into them and rub it , then rinse with water and ware.\nDon't be disgusted, the navy seals and scubadivers do it
280705
Yes such devices exist. I used to have a paintball coach that would fill his tank with his scuba tank.  You can use nitrogen or High Compressed air. Look at my source. Good luck- I know paintball can be expensive (I used to play on a competitive team!).
899553
I got the Vick's cool air humidifier.  (the cool air is supposed to be better)   I think it was about $30 and works pretty well.\n\nI wouldn't' think that trying to make one at home would be a good idea.  Something about sticking my head over a hot pot of water just doesn't sound safe.
415782
yes you can, but you might change your mind when you suck a jellyfish into your suit through the water heater thing.  LOL!  Then, it may not pay enough! LOL!