A warship carrying more than 100 crew members collapsed and sank in the Gulf of Thailand during a storm, according to the Thai navy, leaving 31 servicemen unaccounted for.
The HTMS Sukhothai sank after water flooded its power controls on Sunday night. Images shared by the navy showed some crew who survived in a life raft.
On Monday, authorities said they had rescued 75 sailors, but 31 were still missing in rough seas.
“We will keep looking,” a navy spokesman told the BBC.
Search crews worked through the night to find survivors, with the operation continuing on Monday with air force assistance.
The navy also announced an investigation into the cause of the disaster.
“This has almost never happened in our force’s history, especially to a ship that is still in active use,” spokesman Admiral Pogkrong Monthardpalin told the BBC.
Footage shared by the navy on Twitter showed crew members wrapped in blankets and receiving treatment after they had been rescued. Some were being airlifted to hospital.
Other images showed sailors from the Sukhothai in a life raft, having jumped from the sinking vessel.
One unnamed crew member 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,” he said in a clip shared on local media. “I put on the life jacket and jumped. I swam for three hours.”
Officials said the ship went down after it took on water, which flooded its hull and short-circuited its power room.
With the power lost, the crew battled to retain control of the ship which listed on to its side before sinking around 23:30 local time Sunday (16:30 GMT).
The ship had been on a patrol 32km (20 miles) east of Bang Saphan, in the Prachuap Khiri Khan province, when it got caught in the storm on Sunday.
Source: BBC