I saw a movie of german Kriegsmarine(downloaded ont the peer to peer, enter "U-boot" in the search bar) filmed early in the war and showing a submarine attacked a ship with its deck gun.
The ship sank, but not in large explosions like in SH3.
The strongest explosions came from the explosion of shells that were ravaging on deck.
The piercing shells attacked the hull and were finally sinking the ship.
Please note that it is also possible that it was a propaganda movie...
I think personnally that the biggest explosion are correct only for the tankers and munitions ship.
I can't imagine a ship carrying coffee explode like that.
But it is a game, needs to be spectacular.
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