Did you see DAS BOOT?
Cool when they were getting through the strait, the current being with them meant there was no way back submerged.
But still, there were aces of the deep in the med as well. I recall a British Aircraft carrier being sunk very close to Gibraltar. Ark Royal?
Well, anyway, Gibraltar was an important strategig front. Now, being supplied only by sea, the Germans would have seen very much trouble, had they grabbed the pie.
BTW, Spitfires flew from Gib to Algiers with a slipper tank for fuel.
(double range approx.)