sentences:  Later, when "Sawfish" arrives in the San Francisco Bay area, the crew find a city devoid of any signs of life.Ralph Swain, a crewman who had family in San Francisco, deserts the submarine and swims ashore.Scientist Julian Osborn (Fred Astaire) informs Capt Towers that Swain's contact with the radioactive environment will quickly make it impossible for him to return without killing everyone aboard.