Karl Krüger

naval engineer who provided intelligence about German ships to the British during World War I^[2] and World War II. His identification code was TR/016.^[3] Krüger was a particularly valuable source on German losses from the Battle of Jutland,^[2] and on the development of U-boats.^[3] In approximately 1939, he was betrayed by a German agent within MI6; he failed to show for a meeting in August of that year, and it is presumed he was executed by the Nazis.^[4] His British contacts initially believed he was a Dutchman.^[1] He was connected to the British through the embassy at The Hague; he may have been identified to the Germans by an embassy employee named Folkert van Koutrik, who "was on the Abwehr's payroll."^[5]