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lerpy - 12/01/2013 11:15 AM 
I have no research overly to back this up, but I can offer two pieces of insight. First in all the planning I have done on my computer and all the tables I have looked at, as long as you are under the 21 foot mark there is no limit for no-deco. My computer does not kick into measuring deco until I am below 20FT. As well I have to assume you can stay there a long time as there are several underwater hotels in the world, one in the Keys, they all seem to be at 20FT or less and are not pressurized other than of course air to breath. There’s my non-scientific input.
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Greg - 12/01/2013 3:17 PM
The moon pool at the Jules Undersea Lodge is at 21 feet.
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lerpy - 12/01/2013 5:30 PM
I just ran this by a tech buddy of mine, he says absolutely yes you could.
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so when they say you can get dcs@10ft would pertain to??
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Greg - 12/01/2013 10:54 PM
From UWnewbee: so when they say you can get dcs@10ft would pertain to??
Maybe referring to coming up to fast or lung over expansion if you’re holding your breath.
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Jules doesn’t offer a DB discount so no my cc wouldn’t allow me to stay at 21’ forever :(
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From UWnewbee: so when they say you can get dcs@10ft would pertain to??
Technically decompression sickness is the gases being released into the body as you ascend from depth so yes, you can get dcs at 10 feet. Often times dcs symptoms don’t even appear until several hours after a diver is back on shore.
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yes i know this, but if you lived at 21 feet forever and you can start getting the bends at 10 ft, if you lived 10 years at 21ft would your body be more sensitive to pressure changes more than we are now?
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Now let me ask this: If you lived at 40 feet, or 80, as long as you weren’t breathing compressed gas, there’s be no limit at all correct?
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Greg - 12/03/2013 10:07 AM
From slehman: Now let me ask this: If you lived at 40 feet, or 80, as long as you weren’t breathing compressed gas, there’s be no limit at all correct?
I would assume that if you’re breathing air that is pressurized to 1 Atmosphere (ie: in a submarine or underwater habitat), then it shouldn’t matter what depth you’re at. Of course, as soon as you "step outside" to the increased pressure, you need to follow depth/time limits and decompression rules. Submariners are deep underwater for months at a time and do OK because the sub is pressurized to something close to 1 Atmosphere the entire time.
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21ft must be a new school number and conservative. One atmosphere sea water is 33 ft or 34ft fresh water. So technically 33ft is the no decompression limit. You can stay at 33ft or less for any length of time and ascend with no decompression issues however, if I were to embark on such an experiment i would 1: ascend very slow, 2: make at least 2 or 3 stops for 10 minutes or more and 3: use oxygen at 20ft thats my opinion anyways. When Im doing deco dives I use oxygen above 20 ft for deco.
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