I knew a pilot who rode a A4 into the water after a bridal disengagement on the cat shot. The carrier ran him over and disoriented him. He managed to break the surface after almost two minutes underwater. Within 30 seconds of the helo pulling him aboard there was a loud bang and the AC yelled hang on we’re going in! The helo hit and rolled upside down. He got out but when they pulled him into the helo they punctured his life vest to help get him in. He could not stay afloat and was going under when one of the helo crew members was able to grab him and keep his head above water! Rescued at that point by a whaleboat.