traumatic. >> reporter: the ship was saved but seven crew members could not be. the dreadful news coming back to the states on father's day weekend. xavier martin maryland was 24 years old. >> it's very hard. he's my only child. he's all i have. >> reporter: dakota kyle rigsby was 19, a fireman back in virginia. >> he was a good guy. just a straight up good guy. >> reporter: also injured, the commander, brice benson. >> matter of fact, his cabin was destroyed. he's lucky to be alive and he's at the hospital right now. he's undergoing treatment. >> reporter: both ships had radar systems to warn against collisions, the fitzgerald's extremely advanced. the navy says watch teams are on duty the entire night, so the primary question for american, japanese and philipine vef investigators, how did it