The Bedford Incident

The Bedford Incident is a 1965 BritishAmerican Cold War film starring Richard Widmark and Sidney Poitier and coproduced by Richard Widmark. The cast also features Eric Portman, James MacArthur, Martin Balsam, and Wally Cox, as well as early appearances by Donald Sutherland and Ed Bishop. The screenplay by James Poe is based on the 1963 book by Mark Rascovich. That, in turn, was patterned after Herman Melvilles MobyDick at one point in the film, the captain is advised he is not chasing whales now.

The American destroyer USS Bedford DLG113 detects a Soviet submarine in the GIUK gap near the Greenland coast. Although the U.S. and the Soviet Union are not at war, Captain Eric Finlander Richard Widmark harries his prey mercilessly while civilian photojournalist Ben Munceford Sidney Poitier and NATO naval advisor, Commodore and exWorld War II Uboat captain Wolfgang Schrepke Eric Portman, look on with mounting alarm.Because the submarine is not powered by a nuclear reactor, its submerged run distance is limited, critical when it also needs breathing air and to recharge its batteries. This gives Finlander an advantage but also means the Soviets will be more desperate. Also aboard the ship are Ensign Ralston James MacArthur, an inexperienced young officer constantly being criticized by his captain for small errors and Lieutenant Commander Chester Potter, USNR Martin Balsam, the ships new doctor, who is a reservist recently recalled to active duty. ........

Source: Wikipedia