recruits are trained to swim 350 feet underwater with their hands and feet bound. they're taught to survive in arctic conditions, even submerging in freezing water. they also have to endure exposure to tear gas. only men ranging in age 26 to 33 try out to become one of the 2,500 s.e.a.l.s. training takes two years. 75% don't make it through. even if they do, they need years more experience in the field to even be considered for the elite squad that double tapped bin laden, team 6. >> by the time that you get to six, you will either overcome any weak points that you have in any of those disciplines or you will wash out, and say you are a good s.e.a.l. but you are not good enough for this. >> reporter: he should know. he started team 6. on missions they may jump from a plane 11 miles up,