I don't believe that this is modeled in the game.
As for convoys without escorts; well early on in the war, you can run into quite big convoys with only one destroyer. As the war progresses, the merchant / destroyer ratio shifts quite a bit. My last career I made it to early 1943. By then even medium sized convoys have at least five destroyers escorting them. Sometimes more.
And yes, they do run out of depth charges. But I've never seen it happen. I only know because I heard other people say so on this forum. So you gotta wait a very very very long time for them to run out of dc's I guess.
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