U-598 Holtorf 29-Jul-1942 12 days
Two days before entering the area it met with U-463, a Milch Cow, or floating gas station, in the mid-Atlantic at 28.03N / 58.54W. During the fueling operations machinist Willi Bredereck was diving on the hydroplanes and propellers and was drowned.
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