Deck General · Ship Construction — Double Bottom
A double bottom (tank top over the keel/shell) primarily provides:
- ASpace for ballast/fuel and protection against bottom damage/grounding flooding✓ Correct
- BAdditional cargo lights
- CCrew accommodation
- DA second propeller
Explanation
The double bottom houses ballast, fresh water, and fuel tanks and forms a second watertight skin: if the outer shell is holed in a grounding, the inner bottom may keep the holds dry, limiting flooding and pollution.
Authority: SOLAS II-1; ship construction
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