So heres an idea I came up with for Gibraltar specifically and other such naval bottlenecks possibly.
In 1942 Germany had 23 submarines in the Mediterranean theater (with 4 lost entering) which were never to take part again in the Battle of the Atlantic even when no longer needed as greatly in the Mediterranean.
This was due to the current that runs through the Straight into the Mediterranean which was so strong that in prevented a submarine from returning underwater while one night was not long enough for it to pass along the surface (where it could make headway due to the lesser effect of the current) in one night, thus leaving it very vulnerable, to the point of almost certain destruction, to the garrison at Gibraltar.
So what I propose is making a special case for Gibraltar that would allow submarines to pass from the Atlantic to the Med but not vice versa (surface ships would still be unable to pass through) , I do not know whether this is practical for game purposes (though i certainly like the idea
) or whether this could have a similar effect on the Bosporus, as in that case I do not know how the current would effect it and whether subs could pass through one way or perhaps both (surface ships again limited)
Edit: One more thing, one of the big concerns during the planning of Operation Torch was the Spanish stance toward the invasion, if the Spanish had decided to intervene militarily they could have effectively closed the Med to allied shipping with their artillery even if Gibraltar managed to hold (I read this bit in Eisenhower's Crusade in Europe), so my question is should the Spanish be able to close the Med even if they do not own Gibraltar? I'm not so sure that would be good to add to the game but we can see what you guys think
Another EDIT
: How would later sub models affect this? With newer model with better underwater speed perhaps they could pass from the Med to the Atlantic at night 
In 1942 Germany had 23 submarines in the Mediterranean theater (with 4 lost entering) which were never to take part again in the Battle of the Atlantic even when no longer needed as greatly in the Mediterranean.
This was due to the current that runs through the Straight into the Mediterranean which was so strong that in prevented a submarine from returning underwater while one night was not long enough for it to pass along the surface (where it could make headway due to the lesser effect of the current) in one night, thus leaving it very vulnerable, to the point of almost certain destruction, to the garrison at Gibraltar.
So what I propose is making a special case for Gibraltar that would allow submarines to pass from the Atlantic to the Med but not vice versa (surface ships would still be unable to pass through) , I do not know whether this is practical for game purposes (though i certainly like the idea
Edit: One more thing, one of the big concerns during the planning of Operation Torch was the Spanish stance toward the invasion, if the Spanish had decided to intervene militarily they could have effectively closed the Med to allied shipping with their artillery even if Gibraltar managed to hold (I read this bit in Eisenhower's Crusade in Europe), so my question is should the Spanish be able to close the Med even if they do not own Gibraltar? I'm not so sure that would be good to add to the game but we can see what you guys think
Another EDIT
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