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Lutzow isn't a real battleship. She's a heavy cruiser with 11" guns and an extra pump. She's actually smaller than the Hipper.

And yes, a BB can go down very quickly. Magazine explosions don't happen all that often but catastrophic flooding does. If you get too many lower hull hits too quickly you can't pump out the water fast enough and either flooding or list can reach a fatal threshold. I think this can be effected by Beaufort rating, wind direction, and how much speed the ship has.

I've lost the Scharnhorst in two minutes. To the Gloucester. That was just embarrassing and absurd. I've never gone back to a save game with more justification in my life. Even the Chinese flat-irons at Yalu River couldn't be sunk by 6" shells.