The crew of an American submarine embarks on a reconnaissance mission, photographing Japanese installations using a periscope camera. When they are attacked by the Japanese—paralleling events similar to the USS Perch—the crew is forced to scuttle their submarine and is subsequently captured. Enduring torture at the hands of their captors, the Americans, with the aid of British and Australian prisoners, formulate a daring escape plan in hopes of delivering crucial intelligence to the Allies. The film concludes with dramatic footage of the historic Battle of the Coral Sea, which, according to the story, becomes possible thanks to the information smuggled out by the submariners. Cast: - Cliff Robertson as Lt. Cmdr. Jeff Conway - Gia Scala as Karen Philips - Teru Shimada as Commander Mori - Patricia Cutts as Lt. Peg Whitcomb - Gene Blakely as Lt. Len Ross - L.Q. Jones as Yeoman Halliday - Robin Hughes as Maj. Jammy Harris - Tom Laughlin as Ens. Franklin Runtime: 86 minutes