leaks. it's not clear what caused the train to crash sunday morning but crews are inspecting the tracks. now, back to our special, i'm kellyright. >> rob o'neill had one year of college under his belt, a job delivering pizzas, and only a basic grasp of swimming when a recruiter convinced him to enlist and become a navy seal. by january 1996, after five months of intensive swim training, rob found himself in great lakes, illinois, for navy boot camp. but boot camp was nothing compared to what came next. "buds," or basic underwater demolition seal training, puts recruits through some of the most grueling physical punishment anyone can endure. >> 1, 2, 3... >> most recruits don't even pass the first phase, physical conditioning. >> general workouts every day eventually wear into a 1,000 push-ups a day, 1,000 sit-ups a day, 1,000 flare kicks a day, hundreds of pull-ups, a bunch of times around the big, scary obstacle course. there's obstacles there -- the first time you do it, if you fall off, you're gonna break your neck. miles and miles of soft sand you're running in all the time. it's a mile from where we work out to the ga