From: Utlima Thule
I found that this is a serious flaw in the program since Hitler initially ordered an invasion from Crimea towards the east. Eventually, he called it off. However, it was a huge operation in concert as a two part of operation Uranus--invasion of the Baku oil region. So, the straight is only 4 to 5 miles across and any flotilla attempting to impede on the flow of supplies across it would meet with some siege mortars, Dora the BFG, and the Luftwaffe bombing them incessantly! So, we built a railroad across the country without all these rules? Why not in this game? Ah, "playability", that's it, right? So much for realism. Oh, wait, isn't there an option for giving the 'puter more "humph"?
Maybe I can play with the editor and "fix this"????
Bah Hum Bug!
It does work the same for both sides. The Soviets can't trace rail supply over the Kerch straight so that means to evacuate the factories there before the Germans force the Dniepr and also a decision to try and hold the Crimea can become a huge truck drain.
Its actually a very tricky body of water for navigation as it has a nasty combination of strong currents and varying levels of depth, plus a soft bottom. So for both sides, it is correct to model it as a ferry crossing. In general, the axis powers were short of transport ships in the Black Sea region (esp given how unkeen Bulgaria was about the whole enterprise), so again lacking naval invasion capacity seems reasonable.