This March 29, 2010, file photo shows Ship Salvage Unit members of the South Korean Navy preparing to set out on a search mission to find missing sailors from the sunken South Korean navy ship near South Korea's Baengnyeong Island. The 1,200-ton Cheonan, on a routine patrol with other vessels, went down near the tense maritime border with North Korea following a mysterious explosion. On July 9, 2010, investigators from South Korea, the U.S., Britain, Australia, Canada and Sweden concluded that it was struck by a torpedo of North Korean origin. (AP Photo/Ahn Young-joon)
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