British naval minesweepers are put through their paces at sea.
Unused / unissued material - dates unclear or unknown.
Various shots of British Royal Navy minesweepers at sea.
Various shots of mine detecting equipment being prepared on board ship. A buoy is dragged behind the ship. Sailors watch through binoculars.
Shots of two warship signalling with Aldis Lamps
An on board anti-aircraft gun is prepared and the crew stands at the ready.
Various shots of the minesweeping fleet at sea.