I remember staying overnight on that sub. It was a boy scout thing several years ago. This other guy and I were in the engine room. He pushed forward on one of the control thingies for the engine (must have been the electric engine), found out it still works. He quickly put it back to all stop, and we looked around to make sure nobody else heard the noise, hehe.
Was fun looking through the UZO trying to spot babes in the city