. . . . . "U-171" . . "1940-12-01" . . . "German submarine U-171" . . "German submarine U-171" . "1.232E9" . "6.76" . . "''U-171''" . "1941-07-22" . "1941-10-25" . . . "4.4" . "''U-172''" . "Sunk by amine9 October 1942 in theBay of Biscay. 22 crew killed, 30 survivors." . . . . . "1.12E9" . . . . . . . . . . . "1939-12-23" . . "U-172" . . "76.76" . . "9.6" .