Kapitänleutnant Fritz Steinhoff, who had commanded U-511 during her rocket trials and was captured at sea when he surrendered U-873, was subjected to an abusive interrogation at Portsmouth by the interviewers of U-546's crew.
O Kapitänleutnant Fritz Steinhoff que comandara o U-511 durante as probas con foguetes e que fora capturado despois de render o U-873, foi sometido a técnicas abusivas de interrogatorio en Portsmouth.