Fast-rope and rappelling techniques require helicopters to drop SEALs by way of a rope to their location. Fast roping is a drop technique whereby a 50-to-90-foot (15-to-27-meter) rope is dropped from the helicopter, and SEALs slide down the rope using a Swiss seat harness. To brake, they apply their hands in a towel-wringing motion -- using their feet to brake would damage the rope.