Maritime police search for missing passengers in front of the South Korean ferry "Sewol" which sank at the sea off Jindo April 16, 2014. REUTERS/Kim Hong-Ji/File Photo SEOUL (Reuters) - South Korea prepared on Sunday to raise the Sewol ferry that sank nearly three years ago, killing more than 300 people, most of them children, testing a system to bring the ship to the surface in the hope of finding the last nine bodies.