In March, the Korean corvette Cheonan sank near the border between North and South Korea after suffering an explosion aft. The ship was in shallow water, about 30 meters deep, near South Korea's Baengnyeong Island. The situation between the two Koreas is so delicate, as it is understood in the South, that the South Korean government went out of its way to avoid blaming the North, to the extent that the sinking was initially handled as an unfortunate accident rather than what it most likely was, an act of war.
World Naval Developments: Hard Lessons in the Littorals
By Norman Friedman