Twenty-six films produced by the National Broadcasting Company of America and the United States Navy, with the assistance of the Admiralty and using film obtained from both allied and enemy sources.

The opening episode in this story of naval conflict in World War II covers the anti-U Boat campaign from 1939-41.
Musical score by Richard Rodgers played by the National Symphony Orchestra conducted by Robert Russell Bennett.

The film introduced by Michael Lewis, Professor of History at the Royal Naval College, Greenwich.
(Previously televised on October 27)