>> and this 31-year-old is about to descend. >> there's no exit plan, no escape. >> the plunge down this alaskan kref sis lasted about 16 seconds. the walls were only 16 feet apart. check out the helmet cam view, top speed, 65 to 70 miles an hour. >> you see you're going really fast and the walls are really close to you. >> but cody said he was very zen. >> it's almost as as if time slows down. >> cody's runs makes james bond's exploits on skis look almost wimpy. child 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. >> it won him the best line of