That was in Summer, 1940, when the RN was occupied with Dunkirk. I don't know if any U-Boats even attempted the return trip, Hitler ws determined to keep the numbers up. I know it's not modelled in the game but doesn't the underwater current in the straights favour the trip into the Med. and the surface current the trip back outside? That would mean a submerged exit from the Med. would be very slooow, if not impossible. After 1941, a surfaced run past Gib. must be certain death!
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