Hi,
the two U-boats are U 456 (inner boat) and U 376 alongside Adolf Lüderitz inside Semskefjord. Photos taken between arrival on 20 April 1942 and departure early on 29 April 1942. In the meantime the boats were under repair, using resources aboard Lüderitz.
Although not an S-Boat buff, I am following up the highly professional posts in this thread with great interest. Please keep on.
Axel Niestlé