have seen base jumpers before, but you've probably never met a thrill seeker like 102-year-old dorothy custerwith only a few seconds to pull the chute, base jumping is not for the faint of heart. it's a thrill that world renowned base jumper sean chase nearly every day in twin falls, idaho. >> i have done 2,150 base jumps as of today. i definitely down to risk my life for it still. it's definitely the passion of my life. it's different from skydiving. base jumping is more basic. there's one parachute. no backup because there's no time for one. we pack it like it is the only chance, since it is. >> the bridge sits 500 feet above the snake river in twin falls and it's a hot spot for base jumpers who can legally jump from the bridge any day of the week without a permit. >> i jump off this bridge, i'd say, probably four days a week, about five times a day, on average, about 20 jumps a week. >> three, two, one, see ya! i feel very confident in what i'm doing. i don't feel like i'm taking a huge risk every time. that's fun stuff. >> living just a few minutes away from the action of the bridge is 10