what does scuba mean?
825327
Self Contained Underwater Breathing Apparatus  or ... SCUBA\n\nGot my certifications as a young woman -- and did enjoy the sport a lot.
351412
i would love it if this was possible. seems like it would be if had enough hard working ppl in scuba gear
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?
812724
Try it and let us know.  Is there an ocean deep enough for you to SCUBA dive, ICHI?
246659
Yep. The word "key" in the name means:\n\nMain Entry: key\nFunction: noun\nEtymology: Spanish cayo, from Taino\n: a low island or reef; specifically : any of the coral islets off the southern coast of Florida
333885
The term is actually a reference to the size of a grave... 8 feet long, and 6 feet deep... hence it refers to something being "dead."\n\nIn the restaurant biz, and many other contexts, when someone says "86" something, it means that they've run out, or they want to stop it, etc.
299063
Please.  Your lungs can not be down as much as 3 feet I believe, or the air would be forced out of your lungs.  Now if you snorkel at normal depth, you can hold your breath and go down as far as you can make it.  But you can't breath continuously unless the air is being pumped.  Your head will not collapse, it's filled with liquid which doesn't compress.
1043677
A vacuum is a volume of space that is substansively empty of matter, so that gaseous pressure is much less than standard atmospheric pressure. The root of the word vacuum is the Latin adjective vacuus which means "empty," but space can never be perfectly empty. A perfect vacuum, known as "free space", with a gaseous pressure of absolute zero is a philosophical concept with no physical reality, not least because quantum theory predicts that no volume of space is perfectly empty in this way. Physicists often use the term "vacuum" slightly differently. They discuss ideal test results that would occur in a perfect vacuum, which they simply call "vacuum" in this context, and use the term partial vacuum to refer to the imperfect vacua realized in practice.
48352
It's a sealed room with high barometric pressure.  Sometimes if divers come up too soon, they get a condition called "the bends" in which nitrogen dissolved in the bloodstream starts to come out as bubbles of gas.  (Think of how bubbles come out of soda when you lower the pressure by opening the top.)  So the divers can be put in a hyperbaric chamber, where more of the gas will stay dissolved and the pressure can be lowered gradually.
498878
A submersible is a type of underwater vessel with limited mobility which are typically transported to their area of operation by surface ships or large submarines. Apart from size, the technical difference between a 'submersible' & a 'submarine' is that submersibles are not totally autonomous & rely on a support facility or vessel for charging of batteries & high pressure air & high pressure oxygen replenishment.
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.
126747
In the diving area, there is:\nInstructor (teaching others to dive); guide (used on some/most dive boats) and commercial diver (typically repair and construction).\n\nIn aviation, there are instructors and professional pilots (including the military).
16144
#1 place for scuba is Bonaire, The Netherland Antillies\n\n#2 Would be the Truk Islands
776537
Well, he believed that men should be able to breathe underwater, and he invented scuba gear for that purpose. ( Self Contained Underwater Breathing Apparatus ) Think of how stunted ocean exploration would have been without his ingenuity.....he also believed in preservation of all species and made efforts to be environmentally conscious.
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.
1053798
Exhaling before attempting to descend underwater is simply a matter of allowing the body to displace less water (your chest area will be smaller), thus resulting in a negative state of buoyancy, and you sink.\nTry this to see for yourself. Next time you are in a pool, go to the deep end. Take a deep breath and do not move. Then slowly start to exhale. You will start to descend. The more air you exhale, the more you will find yourself going underwater. Of course only do this if you are comfortable in the water, and can recover from an out of breath state. \nHope this answers your question?!?!
528197
is this for holding your breath?? \n\nThe technique used by the record deep divers is to bring their heart rate down to 10 beats per min, by meditating and relaxing all their muscles\n\nHow you do it? it takes a looot of practice.. I have done relaxation exercises and have gotten my heart rate to under 30.. but those guys are crazy