THREE fishermen were feared dead last night after they were thrown into the sea when their fishing boat sank in a suspected hit-and-run near Waglan Island. A Government Flying Service helicopter and three police launches failed to find them after their boat went down east of Waglan at 3.30 am yesterday. Sailing in thick fog, the 23-metre Hong Kong-licensed boat, with four mainlanders and one Hong Kong man on board, was an hour from its destination, Aberdeen, when it sank. Survivors told of hearing a resounding crash before realising they had been hit in the stern by a large, unidentified ship. Four of the five men were asleep below deck while another was at the helm. Hong Kong resident So Tak-wing, 42, and mainlander Li Fouyau, 30, escaped, staying afloat and calling for their missing colleagues until they were rescued by another passing fishing boat. The other boat is believed to have sailed off after the incident. Maritime Rescue Co-ordination Centre spokesman Eric Chan said the sunken boat had been travelling from China. 'All we know is that it was hit by another unknown vessel 11 nautical miles east of Waglan Island,' said Mr Chan. The search began at 5 am yesterday and the helicopter was called out at 9.15 am. It was suspended as darkness fell at 6 pm, but was due to resume this morning. Police said there was no search for the unidentified commercial ship involved in the crash, as the incident was outside Hong Kong waters. The rescued men were both in a stable condition last night at the Prince of Wales Hospital. They said many of their colleagues had refused to put to sea recently because of foggy conditions.