Rainer Bruns Wrote:
-------------------------------------------------------
> That process releases hydrogen
> gas, which has to evacuated out of it's mechanical
> spaces to prevent unwanted explosion through
> sparks from the e-motor once launched.

I don't have detailed descriptions of this, but from some documents I have, it appears the germans didn't just ventilate the hydrogen, but converted it to an inert gas by means of a catalyzer which was installed in the batteryhatch of the torpedo.