The Cheonan, a South Korean navy patrol ship, sank on March 26, 2010 after an explosion believed to be caused by a torpedo. While 58 survivors were rescued, over 40 sailors remained missing. After a diver died during rescue efforts and a fishing boat collision near the site killed one, South Korea called off the rescue mission at the families' request, though many sailors were likely still inside the sunken wreckage.

1. South Korea Calls Off Rescue for Missing Sailors Julie Pan World History/Per1 Apr. 4, 10

3. The explosion is likely to have been caused by a torpedo

4. 58 survivors were rescued, but more than forty people are still missing

5. Stormy weather delays rescue efforts

7. Subsequently, a fishing boat nearby collided with a Cambodian freighter, resulting in one death

8. All events considered, the search was called off as asked by the families of the victims

9. The objective currently is to salvage the wreckage underwater which can take at least a month

10. High possibility that many of the sailors are still in the sunken ship though the chance of survival is low