http://www.ubootwaffe.net/

16.01.1943 - 22.01.1943
Eleventh Sailing
On the 16th Jan 1943, U-553 left La Pallice under the command of Karl Thurmann and arrived at return on 22nd Jan 1943 after six days.

http://uboat.net/boats/u553.htm

20 Jan 1943. The boat sent its last radio-message on 20 Jan, 1943 when it reported: "Sehrohr unklar" (Periscope not clear). She was never heard from again.

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