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Oil Tankers are ships of varying sizes designed for the bulk carriage of crude oil and various refined spirits. The largest are up to 650,000 tonnes.The current custom is for crude oil to be transported to near its point of use where it is refined as required.
At various times, there have been accidents that have led to serious and catastrophic pollution. Another concern has been the pollution caused by careless cleaning of ships' tanks.
During World War II, the transport of oil and its products was a critical strategic activity, since shortages had a paralysing impact on mechanised nations. The destruction and defence of these ships was, therefore, a prime concern.
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