Anti-torpedo bulkheads
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So your basic quarter inch plate steel in gapped layers. A cellular system might hold against more strikes. I'm thinking of lots of vertical stacks. Gravity works with the fluid. An air filled burst box at the top of each stack. Above the burst boxes is a vent to the outside of the ship, well above the water line.Space more than thickness of plates, I would go for more space divided with vertical bulkheads so you can have, /v/w/v/w/v/ with void and water (or oil) I think tanks are easier to keep working as they can be inspected (and to fix after a hit).
You want to absorb the blast without creating shrapnel so lots of light flexible layers.
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