UBOAT is a simulator of a submarine from WWII era. It is a survival sandbox with crew management mechanics while its primary theme is life of German sailors. The boat is their home, but it can become their grave at any time.
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Interesting, but I think it will need mods to be the best sub sim it wants to be. Playing normally it's just a bit boring, like actually submarines where. It's only when you add all the technical stuff related to that it becomes more interesting to me.