>> ooh, i'm getting nervous. >> reporter: 31-year-old cody townsend is about to descend. >> there's no exit plan. there is no escape. >> reporter: the plunge down this alaskan crevice lasted 13 seconds and the narrowest point was only 6 feet apart. check out the helmet cam view, top speed, 65 to 70 miles per hour. >> you see that you're going really fast. you see that the walls are really close to you. >> reporter: but cody said he was very zen. >> it's almost as if time slows down. holy [ bleep ]. >> reporter: makes bond's exports on skis almost look wimpy. child's play compared to this. so a crevice like that must have a terrifying name, right? >> yeah, it does have nicknames but i would blush if i had to tell you what the nicknames were. >> reporter: cody won him powder