The purpose of this research is to see if people who have had a collapsed lung that has been
re-expanded can be safely taken to an elevation that a person might experience while in a
commercial airplane without having their lung partially collapse again, or have any symptoms
such as feeling short of breath or having oxygen levels in the blood decrease while at the
simulated altitude.

The investigators hypothesize that subjects who have had a collapsed lung that has been
re-expanded will not have any adverse symptoms or signs while subjected to a simulated
altitude of 8400 feet (565mm Hg) or 12650 ft (471mm Hg).