A South Korean maritime police ship (front) and a naval patrol ship patrol to rescue possible survivors from a sunken naval ship 'Cheonan' off Baengnyeongdo, an island near the border with North Korea March 27, 2010.[Agencies]

South Korean Marines stand guard to search possible survivors from a sunken naval ship 'Cheonan' as rubber boats for saving sailors are placed along the seashore on Baengnyeongdo, an island near the border with North Korea March 27, 2010.[Agencies]