Otto Kretschmer (1 May 1912 – 5 August 1998) was the most successful German U-boat commander in the Second World War and later an admiral in the Bundesmarine.
From September 1939 until his surrender in March 1941, he sank 47 ships, a total of 274,333 tons.
For this he received the Knight's Cross of the Iron Cross with Oak Leaves and Swords, among other awards.
He earned the nickname "Silent Otto" both for his successful use of the "silent running" capability of U-boats as well as for his reluctance to transmit radio messages during patrols.
After the war, he served in the German Federal Navy and retired in 1970 with the rank of Flottillenadmiral (flotilla admiral).
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