yes, sunk ships reappearing after saves is a known "issue" as well an unreal detection of your sub at long distances in conditions were spotting you should be and is not possible. not to mention the unreal sniper accuracy of the guns on ships that can spot and hit your periscope at ranges in excess of 5,000 meters!
it is a game and its built in need to make it difficult on you to keep things "fun" means things like this are just part of the game
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