The lower picture is the u-boat featured in the TV series. One of the characters says it's a Type VII-C. I thought all Bs and Cs had the hockey club shaped arrangement of drain holes, but the one in the series lacks the upper 4 holes.
What's up with that?
BTW, this has to be the worst managed u-boat in the history of the Kriegsmarine. Petty conflicts, frequent fistfights among the crew members, blame games, the Kaleun letting the XO get away with blatant disloyalty and insubordination, a general atmosphere of disharmony, and absolutely
zero team spirit within the crew.
If the German armed forces would have been like that, the war would have been over in 2 weeks, with the Polish cavalry beating the crap out of the German Panzer corps.