von Zelda

For the sake of realism, IIRC transferring torps from upper deck canisters to the forward or aft torpedo rooms was done during daylight hours (one had to be able to see) and at a dead stop.

Transferring torps was a long hard job and became very dangerous due to aricraft as the war progressed. In the later years, the only u-boats allowed to carry torps in the upperdeck canisters were the u-boats traveling to the South Atlantic, Indian ocean and far east.