| http://www.w3.org/ns/prov#value | - ulkheads, strengthen and reinforce the shell.[15] Another feature of recent hulls is a set of double-bottom tanks, which provide a second watertight shell that runs most of the length of a ship.[16] The double-bottoms generally hold liquids such as fuel oil, ballast water or fresh water.[16]A ship's engine room houses its main engines and auxiliary machinery such as the fresh water and sewage syst
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