Narrator:Felix Baumgartner's mission depends entirely on one of the least heralded but most remarkable pieces of equipment a balloon. Narrator:It's the oldest flying machine of them all.

Hear from Felix Baumgartner, Joseph Kittinger and Luke Aikins at the Red Bull Air Race in Indianapolis about their thoughts on Red Bull Stratos, looking back on the event five years to the day.

Felix Baumgartner:If something goes wrong ... Narrator:On the day of Felix's record-breaking jump, his pressure suit and oxygen supply worked perfectly. All of the team's precautions and hard ...