I will add that from u-boat KTBs during the first 10 days of transit the U-boat would during a dive to A -30 ( 30 meters ) withdraw and "Level" torpedos ( for accurate Depth keeping of torpedos ) charge the batteries, degaussing with vasaline and Self-ventilate after charging for 15 minutes. This ventilation occurred in the tubes only. Also leaving for patrol Tube 1 was empty, tubes 2-4 were stored torpedos "not ready. 3 were stored Port. 3 starboard. 2 under the floor. And one air torpedo to be "quick readied" for opportunities for tube 1. Later I will post a link to some documents. For certain procedures. But like I said reading KTBs is very helpful as Kaluens wrote usually dived to A-30, Torpedo Maintenance. Das Boot accurately showed part of this procedure. At least tube 3 in this scene was a TI as they inserted Boat Air Supply.
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