Getting in to the med is easy. Real easy. Even late-war.
Here's how to do it:
Once you are coming closer to Gibraltar, have your best watch crew on deck. Once the watch crew spots the patrolling warships, crash dive to ~180m. When there, rig for silent running and plot a course straight through the Gib straight. Set speed ~2 knots. After this, dismiss your radio & sonar operators (to stop TC from being interrupted every 10th second) and put TC to 512x. Read a book while waiting. Needless to say, when You are cleared through, get to a safe distance, wait for the night and surface, recharging batteries and letting the crew rest.
Voila!
I've done it this way many many times, and so far it has always been a succesful tactic.
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