Filmed at Pembroke Dock Yard, Dyfed, Wales.
Introductory intertitle reads: "In the first days of the war, HMS Birmingham distinguished herself by sinking a German submarine. Today, she stands under the hands of the Shipbreakers." M/S of the ship in dock. Various shots of the ship being dismantled....
Sailors go through training to become members of the Submarine Corps.
Cuts (out takes, rushes) for SALVAGE ATTEMPT FAILS in G 1310.
Footage of two men demonstrating small U-boat.
Material showing submarine base. Surrender of U-Boats U802 and U826.
Australian newsreel item about making and testing torpedoes.
Men practising escape from 'A' class submarine.
Testing submarine by inventor Vassena.
Footage of miniature sub.