I agree with commentators here. This, and other deep sea stuff, is awesome. I'm fascinated that it's being done by private companies, and the competition between Cameron and Branson just adds to the awesomeness. (Branson appears to be losing badly.)
I don't believe there is any specific limit, as long as you give enough time to change the pressure gradually. However at higher pressures you need to reduce the oxygen and co2 concentrations (since at higher pressures they dissolve too easily). (You want to keep the partial pressure constant, even though the absolute pressure goes up.)
Lets say a human can cope with 10 atmospheres. (I have no idea what a human can cope with.) That still leaves 990, plus extra for safety margin.
(http://www.extremetech.com/extreme/121183-the-tech-that-will...)
(http://news.ycombinator.com/item?id=3680367)
I agree with commentators here. This, and other deep sea stuff, is awesome. I'm fascinated that it's being done by private companies, and the competition between Cameron and Branson just adds to the awesomeness. (Branson appears to be losing badly.)