a sky diver is running out of time, and altitude. >> i could see my altimeter going into the red zone. >> the only two things that separate him from almost certain death. >> this was 100% unprecedented for me, and unimaginable. ♪ >> the parachute center in encampo, california, is open for business, weather permitting, 365 days a year. world championship sky driver greg stapleton has more than 7,000 jumps under his belt. >> everything can happen in a split second. it can all change in a moment's notice, so you've got to be ready. you've got to be on the edge. >> stapleton is one of an elite group doing formation sky dives which involve the risky maneuver of holding onto a fellow jumper's chute in mid air. >> there is probably only 500 people on the planet who do formation sky diving with their parachute open.