On the night of 13 March 1944, the Greek-registered steamship SS Peleus was en route from Freetown to Buenos Aires when she was hit amidships by two torpedoes, launched by a German U-boat, U-852. The twin-masted merchantman, of around 5,000 tons, swiftly began to sink, her internal bulkheads ruptured by the detonations. Within three minutes, the Peleus disappeared below the surface, leaving the surviving members of her 39-strong crew clinging to rafts and flotsam in the darkness.
As sinkings go during the naval war, it was unremarkable, one might even say routine. But what followed would set it apart. Soon after, U-852 surfaced close to the debris field, hoping to identify her prey and glean some information. Her captain, 27-year-old Kapitänleutnant Heinz-Wilhelm Eck, ordered one of his men – who…