Multi-compartment warship construction is sometimes referred to as a torpedo defense system. It consists of a four-bulkhead system. The outboard layer of tanks is filled with liquid. Fuel oil service tanks in the second and third layers make up the rest of the system...somewhat like a honeycomb.
The fuel oik tanks can be counter-flooded with sea water to correct a list, a practice used extensively on Yamato.
I only have experience with SH4, so maybe one of the experts will chime in....
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