Underwater Cable Drag … The scene is during the storm where the character “Murph” doubled by Mike Brady was hooked in the hand and sent over board. The cable snatched him and drug him down to a depth of about 30′. He had to hold his breath for just under two minutes while struggling and waiting for “Sully” Pete Turner and Sean Graham (doubling Mark Wahlberg’s character) to swim the length of the tank in full clothing under water to his rescue.