Surviving under water in an air bubble
Does anyone know how survivable rapidly surfacing from 30 meters would be?  Wolfram Alpha has the pressure down there at almost 400 kPa (compared to 100 kPa) so my suspicion is "not at all", but I'm not really familiar with the tolerances and life expectancies with the bends.<p>30 meters is just agonizingly close to the surface though, well within what most adults could do horizontally (particularly if their life depended on it.)  Being that close to the surface, but still so far away, must be absolutely awful.