If you find yourself in an unpressurized aircraft at cruising altitudes, you have bigger problems than the bends..
Normally not true. If you lose cabin pressurization at altitude, even a rapid decompression, it normally is not that big of a deal (assuming that the aircraft has not had some other catastrophic structural failure). Aircrews routinely practice loss of cabin pressurization during simulator training and evaluations, and hyperbaric chamber crew members routinely ride in the chamber while training military pilots. The recovery procedure involves getting on 100% oxygen, declaring an emergency for a rapid, but controlled, descent, and flying the airplane to an altitude below 10,000 ft or minimum obstruction clearance altitude. While the descent procedure may frighten the passengers, it really is not that big of a deal as far as inflight emergencies are concerned. I would rather have a rapid decompression once a month than a single episode of DCS.