 Professional skydivers, most with several thousand jumps to their  credit, were brought in from California to double for the actors.  During one take an unexpected gust of wind pulled the chute and  caused one of the skydivers to be slammed into the ground, breaking  his collar bone and dislocating his shoulder. Even though in great  pain, he stayed in character and managed to get up and finish the  scene. He was retained by the director as a consultant.