A realistic re-creation of a 1939 mission to rescue 33 survivors from an immobilized U.S. sub, resting on the floor of the Atlantic off Portsmouth, N.H. Swede: Sam Neill. Capt. Naquin: Shea Whigham. Adm. Cole: James B. Sikking. Frances: Emily Procter. Sibitzky: Matthew Wait. Harold Preble: Vincenzo Riotta. Gainor: Alex McSweeney. Doyle: Martin McDougall.