Perry Mason Season 3 Episode 23 The Case of the Slandered Submarine

Commander James Page is testing electronic equipment on the U.S. Navy sub Moray. It's commander, Burke, is assisting the police in the investigation of a murdered cafe sing, as the police suspect a submariner may be responsible. On the day of the tests, Page is found dead and a sailor, Chapman, is implicated in the murder of the commander and the cafe singer.