I believe this is the air ventilator, in the compass room. Is that what it looks like?
Whether it is or not, the tourguide captain happily told us that the main ventilator - the noisiest machine on board according to him - still functions, and at the hit of a switch it indeed roared into action.
Likewise, all the alarms and speaking tubes on the boat are fully functional, as he also gladly demonstrated.
Controls in the very cramped central compartment. It's tiny compared to the Zentrale on U-boats or the control room on US fleet subs.
Kids playing with the observation scope.
Me playing with the observation scope

. All I could see was light.
They let me climb up the conning tower ladder and peer in to take a picture. It was neat.
To be continued...