After the Exxon Valdez oil spill disaster , when that ship grounded on Bligh Reef outside the port of Valdez , Alaska in 1989 , the US Government required all new oil tankers built for use between US ports to be equipped with a full double hull . However , the damage to the Exxon Valdez penetrated sections of the hull ( the slops oil tanks , or slop tanks ) that were protected by a double bottom , or partial double hull
Exxon Valdez oil spill
Exxon Valdez oil spill
Double-hulled tanker