HAMSs of triple-barrelled antiaircraft gun revolving on base, of two sailors sighting two antiaircraft guns. PAN from sign "Engage the enemy more closely" to sailors running to man guns. MS of sailors turning antiaircraft gun to follow target. CU of gun sights. Naval officer pointing to section of diagram, sailors grouped around him. LS of torpedoed submarine sinking slowly. LS of submarine's conning tower showing above water. Several LSs of submarine sinking, sailors abandoning it and swimming to dinghy. MS of two dinghies coming alongside ship. MS of sailors climbing out of dinghies into corvette. Two CSs of ASDIC wave bands on radar screen. LS of Admiral Nelles reviewing crew of corvette "Port Arthur". MS of three sailors piping admiral aboard. HAS of corvette's bow and rigging. HAS of sailors painting bow of ship. LS of four-inch gun on bow of ship. MS of gun and gun crew. LS of sailor climbing to lookout. HAS of sailor painting deck of ship. HAS of sailors covering gun on deck. LS of corvette signalling with blinker lights, two corvettes in background. MS of ship's rigging and signal flags. LS of boom, PAN to rigging of "Port Arthur" pilot ship. PAN from bridge of "Port Arthur" to corvette "Digby" in Pictou Harbour, Nova Scotia.