alternatehistory.com

Ultimately over 60 Uboats tried or successfully made it into the Mediterranean from 1939-1945, while over 30 Italian submarines made it into the Atlantic during the war; what if instead of the Germans and Italians breaking into each others zones they stayed in the areas their boats were designed for? The Germans noted they wasted a lot of effort trying to operate in the Mediterranean and the Italians had problems in the Atlantic, while in the process the Germans lost over 13 Uboats trying to get into the Mediterranean.
https://en.wikipedia.org/wiki/Battle_of_the_Atlantic_(1939–1945)
https://en.wikipedia.org/wiki/Mediterranean_U-boat_Campaign

How would this affect the Battle of the Atlantic and Mediterranean?
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