Adam,
Really all depends on how the ship is configured. A "modern" supertanker/VLCC/ULCC may infact have the room/settlers/storage elsewhere not to have to use doublebottoms for fuel. Ballast tanks and fuel tanks are absolutely segregated, in the "old" days they weren't. But as you know most ships just like that one pictures is where they keep thier fuel.
The Government owned reserve fllet still regualted just as much as the privately owned but some things they have thier own little book. Like Pollution control.
My whole purpose for mentioning this is to let the guys know that double hulls will not end every spill. They will just help the situation.
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