Titles read: "NAVY SINKS THREE U-BOATS".
Several shots of a British naval convoy at sea. Brief shots of U-boats as commentator talks of German planes and U-boats attacking a British convoy of over 30 ships. German planes drop bombs. Various shots of warship guns firing....
Views of the M2 submarine, before it sank and aerial views of the search for the wreck.
Ships, flying boats and submarines at sea after the loss of the M2.
Yes - it is a shot of a little bedraggled flag - marking the place where the M2 submarine sank.
They Royal Navy bombard the Norwegian coast and rescue Polish sailors from sinking ship.
HMAS Australia is deliberately sunk by own navy - part of Washington Treaty.
Footage of aeroplanes and naval ships combining to sink submarine.
German sailors manning warship guns + shots of ship hit by guns sinking.