U-732 Carlsen 9-Aug-1943 4 days
Carlsen had good reason to avoid fortified Allied channels – he would be attacked twice in or near the Windward Passage. Rounding the northwest tip of Haiti on the 11th of July, the following day two US OS2U Kingfisher scout aircraft surprised the Type VIIC boat on the surface, damaging it slightly but not injuring any of the crew (Blair Vol. 2, p.364).
SOURCES: Gudmundur Helgason, Rainer Kolbicz, www.uboat.net, 2013, Kenneth Wynn, U-boat Operations of the Second World War, Volume 1 and Volume 2, 1997, R. Busch, and H.-J. Röll, German U-boat Commanders of World War II, 1988, Franz Kurowski, Knights Cross Holders of the U-boat Service, Clay Blair, Hitler’s U-boat War, The Hunters, 1939-1942, and Hitler’s U-boat War, The Hunted, 1942-1945, 2000