A look at a torpedo workshop in South Africa and a test run on an enemy ship.
Various exterior shots of new workshops where torpedoes are made. Various interior shots as they assemble them. Women from the W.R.N.S. (Women's Royal Naval Service) march past. A torpedo is wheeled out, various shots of the squadron lined up. They take off for a practise run. They fly out and drop the torpedoes near an enemy ship.