he's lucky to be alive and he's at the hospital right now undergoing treatment but he's not available for questions. >> reporter: the u.s. coast guard will lead a separate investigation into the casualties and the painful question of why some sailors never made it out. the process of finding answers of what went wrong how the two massive ships collided could be a long one. the navy called for its own investigation but there could be additional investigations carried out by the coast guard. at the same time everyone working to determine how the two ships could have been put on a path toward collision. >> alexandra field reporting from japan. our hearts, thoughts and prayers are go out to the families of those servicemen. we'll be right back.