Double-hulled tanker
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A double-hulled tanker is a large tanker ship used for transporting liquids (usually petroleum).
The ship has two hulls to prevent the liquid cargo from spilling; if the outer hull is breached, the inner hull keeps the transported substance in place.
Double-hulled tankers were required after the Exxon Valdez oil spill. The U.S. Congress passed The Oil Pollution Act of 1990 requiring double-hull tankers now, but allowing the transportation companies until 2015 to replace existing tankers.