How wrecks are raised from the bottom of the sea.
This film is about new methods being used to raise sunken ships from the bottom of the sea.
Huge pontoons are lowered beneath the surface. Various shots of the ship lowering the pontoon, intercut with graphic illustrations explaining the process. A "novel sea tractor" then follows. We see the tractor being moved and lowered into the sea. An animation shows how the tractor is lowered. The tractor drills holes in the side of the ship and attaches pontoons.
Pontoon hooks are fastened to the wreck. Air is pumped into the pontoon and they rise to the surface - this is shown through animation, then we see the wreck rising to the surface. Sailors walk on deck of the raised wreck. Panning shot of the raised ship.
Was an item in Pathe Pictorial issue number 692.