Where do you think the XXI exhaust is?

[Hitman]

I think the exhaust was vented from the conning tower rear (actually watch tower level). Also, IIRC the model in SH3 actually has a vent on the conning tower but I'm not sure, never really used the 21.

I think this shows the exhaust system.

Hummmm I would say quite the opposite....the wide diameter tube in the conning tower is in fact the admission for fresh air, and in fact if you follow it to the end you will see a second "pagoda" valve whic is in fact the one for the snorkel (Vertically raised up)

I would instead say that the exhaust is here (Marked in the green circle in this 1945 picture) :





and you can check that still nowadays in the Wilhelm Bauer, although the plates around the hole were modified in post war.:hmm: