The story of the submarine, with contributions from some of the world's submariners. The experiments of early inventors and the hardship of life in their boats - when the white mice died of petrol fumes and foul air it was time to come up; the revolutionary effect of the submarine on the war at sea' underhand, unfair, and damned un-English the experience of long, hazardous wartime patrols by men engaged in the most dangerous form of sea service. The faith and devotion both of the inventors of submarines and of the submariner has turned a frail midget into the capital ship of the present age - ingenious, expensive, unimaginably destructive. Written by CORRELLI BARNETT Narrator JOHN STOCKBRIDGE Produced by HARRY HASTINGS