The Thai navy says 31 sailors are missing after one of its warships capsized in the Gulf of Thailand.
The HTMS Sukhothai ship carrying more than 100 crew capsized after water flooded its power controls on Sunday night.
Authorities said they had rescued 75 sailors, but 31 were still missing in rough seas, as of Monday morning.
Search crews worked through Sunday night to find survivors, with the operation extending into Monday with air force assistance.
The navy also announced an investigation into the cause of the disaster.
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A spokesman, Admiral Pogkrong Monthardpalin told the BBC, “This has almost never happened in our force’s history, especially to a ship that is still in active use.”
An unnamed crew member in a video shared by local media said he had been in the water for several hours before he was rescued.
“The waves were quite high, about three metres when the ship sank, I put on the life jacket and jumped. I swam for three hours,” he said.