S.e.a.l. candidate who died during what s sometimes called hell week it s a brutal physical and mental test for sailors determined to join the elite ranks courtney kube has details. reporter: the navy today identified kyle mullen as the 24-year-old sailor who died friday. another fellow sailor left hospitalized. they were not actively training, but hours earlier had completed one of the most brutal tests of physical endurance. the so-called hell week for those wishing to become navy s.e.a.l.s, they must tread water for hours, run and swim for miles and endure physical conditioning. during that entire week, you get an average of about four hours of sleep it is hell there s no better way to say it. reporter: friday evening mullen and the other sailor were resting in the barracks when they both suffered medical distress, according to a military official. the other sailor is in stable condition tonight. in a statement, the navy extends its