Explosions on ships while sinking were quite normal when the seawater reached the boilers, especially when they were still functioning.
So it is not that inaccurate.
About the change of boat to type VII. It is strange that it has not happened to you yet. If I remember correctly you were given an option to choose a type VII in the bunker with that maintenance guy, or at least you should have. Maybe Vecko knows.
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