On the night of February 3, 1943, a German submarine fired three torpedoes off the coast of Greenland, sinking a U.S. Army troop ship, the Dorchester, with more than 900 men on board. The ship sank quickly and nearly 700 men died — the third largest loss of life at sea in World War II. Onboard with the soldiers were four military chaplains — Protestant, Catholic, and Jewish. As the ship sank, survivors witnessed the chaplains leading many of the men in prayer, then giving up their lifejackets, linking arms and going down with the ship. David Fox is the nephew of one of the chaplains. He interviewed many of the surviving veterans of the Dorchester and of the German submarine which torpedoed them. Together, Fox and the Dochester veterans tell the story of its last voyage at sea, and the brave, selfless acts of the four chaplains during the ship's final moments.