"U-691, a Type IXD/42 U-boat under the nominal command of Kapitänleutnant Günter Bischoff, and the acting command of Oberleutnant zur See Karl Beck, transmitted an Enigma message to U-boat Command at 2000 hours Greenwich time. The message states that, three hours after sinking a Trinidadian merchantman, U-691 torpedoed and sank a Royal Navy submarine that was picking up survivors. Beck has captured two of our men: Marine Sergeant Robert Shaftoe, an American, and Lieutenant Enoch Root, ANZAC."