Does anyone dive below 300feet.timdawg712000@yah...
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Yes, commercial oilfield divers regularly work at that depth and deeper. It has become fashionable for amatuer scuba divers to exceed 300' also, though the equipment and minimal back-up they have make this a risky enterprise.Right now, as you read this there will be an oilfield diver working offshore Brazil in 1,400... yes 1,400 feet of water!
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Yes - approximate depth boundaries are:for SCUBA diving:
0 - 30m (100ft)
Normal limit for sport (non-decompression) diving
30 - 50m (160ft)
Maximum practical limit for air diving, usually decompressing on rich (50-100% O2) nitrox mixtures (NB 60m/200ft is possible on air, but the N2-narcotic effect is fairly extreme - greater depths raise the risk of O2 toxicity unacceptably high)
50 - 250m (800ft)
"Mixed-gas" (i.e. trimix, heliox, rich nitrox) territory - lots of tanks and complicated planning if diving open circuit SCUBA, even more so if diving closed circuit SCUBA (rebreathers)
Supplied gas diving:
For practical purposes, only commercial and military divers on umbilical gas lines (usually from a diving bell) can dive deeper than about 250m (800ft), as the decompression penalty for this kind of "saturation" diving is usually more than 24 hours (i.e. it's not possible to carry sufficient gas supplies for SCUBA diving, never mind the risk of hypothermia from the exposure)
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Anything below 150 feet is strictly technical diving - if you want reasonable chances for survival. As far as being fashionable diving to 300 feet on air - a guy from Italy did this while I was in Roatan - for his birthday (20 something). They got him to the decompression chamber and had him on life support for a day or so but whereas he was not "technically" dead, for all intents and purposes he was dead - the nerve damage is not recoverable. Nerve damage does not reverse itself. They flew him out so he did not "technically" die there.More Questions & Answers...