Underwater breathing device.?
478008
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.
453046
A device for passing measured amount of gas or compressed air under constant pressure through gas meters to test accuracy of meters.\n\nkindly check below websites also :)
1094383
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?
451585
water\n\n[edit] 6 seconds too slow!
313719
First off, I'm assuming you mean breathing through a scuba regulator or snorkel.  Otherwise, I'm impressed. ;)\n\nWater, because the molecules are more dense than air, can transmit the compression wave of sound better, which would be why you can hear all sounds better.
363584
Most US Navy subs can do at least 40 MPH submerged. I don't think you could hang on, even if you could survive the impact. And they have a little thing called sonar which keeps people from being able to sneak up on them unobserved. The sonar puts out pulses that can travel a hundred miles and return, they are pretty powerful. Used in 'antipersonnel mode', it would be like getting hit with a sledgehammer.\n\nWhat you need is a 'density shunt', a powered suit of armor of material MUCH denser than water (and you), like osmium. It is a rare metal, so this would be expensive. But in theory, with an osmium diving suit, the sonar pulses would travel through the suit, around you,and would affect you much less than if you were in contact with the water. \n\nTo get hold of the sub, instead of suction cups, I'd recommend a grappling hook with a cable, loop the cable around the conning tower. They'd have to have guys come out and physically cut the cable before they could get rid of you. \n\nWatch out for those SEALS, though. You might need to use some exploding harpoons from a CO2 powered spear gun to keep them from stopping you.... uh, just what is it you were planning anyhow...? Nothing bad, right, I mean, you're a loyal American, aren't you...? I hope I didn't just give away the weaknesses of the Navy. Listen, don't tell this to anybody else, OK?
445834
A Black Sea Bass!\nNow I've been SCUBA diving since 1971 and have been around the Caribbean, Hawaii, and Southern California and thought I'd pretty much seen everything but on this one trip, to San Clemente Island, I was SCUBA diving with a couple of girls on a chartered dive boat off from San Clemente Island one Summer, and I was watching, (with great humor), the two girls trying to load their spearguns down on the bottom in about 30 feet of water when all of a sudden, (on the far side of the girls), a bass about the size of a Volkswagon Beatle comes lumbering up to see what's going on! The first thing that came to mind was the "Fish Pool" on board the dive boat for the person who nabs the largest fish of the day, (and my speargun was loaded!). The second thought was, if I don't make the perfect "kill" shot on the first try, I'm either going for a LONG ride or, at worst, I'll lose my only speargun! Then, as my heart started idling down, I realized that this fish was on the endangered species list and there was no way I was going to get nailed for shooting one these bad boys!!! So, just for fun, I placed my hands on either side of my girlfriend's head and gently turned it towards the fish and watched as she filled the water with frantic bubbles as she shook her girlfriend and pointed to the fish, at which time that girl started blowing bubbles like a freight train! Hillarious!!!\nAnyway, as we all settled down I drifted up and over the girls and headed gently over towards the fish. I got close enough to shake hands before he slowly turned and started heading towards deeper water! What a rush!\n(And me without even so much as a camera!!!!!)
140188
I bet you could look this up on the web pretty easily. Why didn't you try?\n\nI bet the diffusivity is pretty good, however, because otherwise, how could fish breathe?
428073
If you are hyperventilating or have eratic breathing, it would help control that as you can't breathe and swallow at the same time. (If you do you'll drown).
998739
There is two kinds of breath control\n\nstatic and dynamic.. \n\nwhen you just put your face in the water and hold your breath, you are static, to improve your breath control you need to relax everything and bring your HR as low as you can.. my best 3:30 \n\nwhen you are moving, thats when it hurts.. and this is the test of how good your breath control is.. to get better in this it takes a loooot of practice.. my best 100meters ( no fins ).. 125m (w/fins )
568003
Dude, where did you come up with this schtuff? *LMAO*\n\nIt's called "Drown Proofing", and it's designed to allow the soldiers to get used to being in water for an extended time.  It training on how to use your uniform as life preservers, and to use/discard equipment when placed in that type of environment.
825327
Self Contained Underwater Breathing Apparatus  or ... SCUBA\n\nGot my certifications as a young woman -- and did enjoy the sport a lot.
625406
Scuba is an acronym for \nSelf \nContained \nUnderwater \nBreathing \nApparatus\n\nYou need an air tank with a regulator.  You should have some device for monitoring your air supply, normally just a wrist-watch with a timer, telling you how much time you have left (estimated, based upon average consumption).  If you're doing something strenuous down there, you'll burn through the oxygen more quickly.\n\nYou'll want swim-fins and goggles, and depending on the water temp, a full wetsuit to keep warm.
470388
I have an Idea-wear a snorkel and a divers body suit the next time you attempt to sleep...
725854
Liquid Breathing\n\nA lot of you I am sure have seen the movie "The Abyss". If not then it doesn't matter but what is important however, is one of the diving techniques that they use. This technique is called Liquid Breathing. Until not long ago, people thought that this was fictitious and was not possible but in fact it has been around for a lot longer than you might think!\n\nThe general type of liquid used by the US Navy and other Navies in the world generally have a perfluorocarbon type composition. The type of halide attached onto the molecule depends but it is either fluorine or bromine. However, the only problem associated with using bromine is that it is a very strong greenhouse gas but it could be regenerated through special filters and rebreathers.\n\nADVANTAGES\n\nIt  seems like an odd concept but:\n\n1- Due to its density, Liquivent (marketed name for liquid breathing liquid) can carry as much as 25 times as much oxygen than blood and it has enormous potential for patients with lung and breathing disorders. \n\n2- If fluid is taken into the lungs whilst diving, then the pressure in the body could match that of the pressure of the surrounding water. Thus breathing would be easier and lower concentrations would only be needed. \n\n3- Thus, this would also eliminate the need for decompression and its inherent problems i.e. nitrogen narcosis and the bends.\n\n4- A given volume of oxygen-saturated fluorocarbon contains 3 times as much oxygen as the same volume of air or whole blood.\n\n5- According to the movie "The Abyss", the deepest suit dive was to 4800ft which is equivalent to about 300atmospheres of pressure! Tests with mice have been done at pressures of up to 8000ft.\n\nHISTORY\n\nThis concept originated in the mid 60's when Dr Kylstra a physiologist realised that salt solutions could be saturated with oxygen at high pressures. However, after several experiments he concluded that this mixture becomes toxic due to the build up of carbon dioxide. Therefore, a new mixture that could be saturated with oxygen and get rid of carbon dioxide quickly and efficiently had to be thought of.\n\nAfter further experimentation in 1969, Dr Clark realised that oxygen and carbon dioxide were very soluble in fluorocarbon liquids like freon. Assuming the lungs could cope with this material, Dr Clark figured that these fluorocarbons could support respiration of animals.\n\nLater developments\n\nDuring later years, the techniques of liquid breathing were constantly refined and improved. The survival rate of all the tested animals in recent years has been very high, thanks mainly to improvements in carbon dioxide elimination. Current liquids used can dissolve over 65 ml of oxygen and 228 ml of carbon dioxide per 100 ml perfluorocarbon. By the early 1990s this procedure was developed:-\n\n   1. The animal was anesthetized with intravenous sodium thiopental.\n   2. The animal was put on its back. A tube was placed down its airway, ready for the liquid breathing medium.\n   3. A blood sample was taken. The temperature of the liquid was adjusted correspondingly. It was no longer necessary to make the animals hypothermic.\n   4. The perfluorocarbon was instilled into the animal's lungs through the tube.\n   5. A floor-mounted 3-litre reservoir was filled with the perfluorocarbon. The liquid was driven by a pump through a series of machines which warmed and oxygenated the liquid and took the carbon dioxide out of it. The liquid flowed through a tube into a 3-way pneumatic valve which directed flow to the animal. A computer controlled the inspiration (18 ml of fluid per second), pumping the liquid into the animal's lungs, then back out again to the reservoir, at a rate of about 6 complete respirations per minute.\n   6. At the end of the test, the animal was tilted for about 15 seconds and the perfluorocarbon was allowed to drain from the lungs. This can be seen in the film The Abyss where Ensign Monk drain
95196
isnt it obvious? we cant breath underwater.. unless we have gills like the fishes!!!
87692
http://www.oceanexplorer.noaa.gov/technology/technology.html