Suddenly, the siren was sounded for a crash dive. The survivor helped secure the 37 mm. gun and then noticed that one of the gunners had been wounded. He struggled forward with the wounded man,attempting to bring him into the boat. As they approached the conning tower hatch, it was slammed shut and the U-boat began to submerge. In a moment, the 2 men were in the water, pulled under by the suction, but clear of the boat.