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Skydive from the StratosphereAltitude: 40,000 ft Airspeed: 160 mph You have passed the coldest part of the atmosphere. Still, the warm, moist air within your helmet condenses, fogging up the helmet's shield. You may be thinking about deploying your main chute. A word of caution: opening your chute while falling too fast will put great strain on the material and on your body. Continue Escape Through Time | Skydive | Human Response Survivor Stories | Pioneers of Survival | Survival Strategies Resources | Teacher's Guide | Transcripts | Site Map | Escape! Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |