Views of the M2 submarine, before it sank and aerial views of the search for the wreck.
Yes - it is a shot of a little bedraggled flag - marking the place where the M2 submarine sank.
King George V and Queen Mary visit a submarine on the Clyde.
Royal Navy attend remembrance service for dead of M2 submarine, then place wreaths at sea.
Ships, flying boats and submarines at sea after the loss of the M2.