JINDO, South Korea (AFP) - Rescuers worked frantically on Thursday to find 300 people - mostly schoolchildren - missing after a South Korean ferry capsized, with prospects of pulling survivors from the submerged vessel dimming as emotions boiled over among anguished relatives.
Nine people were confirmed dead, but with every hour that passed fears mounted for the 287 still unaccounted for after the multi-deck vessel with 475 on board suddenly listed, capsized and then sank within the space of 90 minutes on Wednesday morning.
Worsening weather fuelled the sombre mood, with persistent rain and choppy seas further hindering dive teams already struggling with low visibility and strong currents.
"Honestly, I think the chances of finding anyone alive are close to zero," a coast guard official told an AFP journalist on one of the boats at the site.
Naval and coast guard vessels had used floodlights and flares throughout the night to maintain a search now involving more than 500 divers, 169 vessels and 29 aircraft.
The strength of the currents experienced by the divers was underlined by the fact that the ship had drifted several kilometres since going down.
Mr Chung Dong Nam, the head of one civilian diving team at the site, said three of his men had to be rescued after being swept out to sea.
"We've tried repeatedly to get into the ship but the waves and currents are too powerful," Chung told the YTN news channel.
"These men are risking their lives," he added.
But distraught relatives gathered in a gymnasium on nearby Jindo island insisted more should be done, and vented their grief and frustration to anyone who would listen.
"Get my child out of that ship! Dead or alive," one distraught father repeatedly shouted to rescue and local government officials.
A total of 375 high school students were on board, travelling with their teachers to the popular island resort of Jeju.
When South Korean Prime Minister Chung Hong-Won visited the gymnasium in Jindo on Thursday morning, he was jostled and shouted at, and water bottles were thrown.
"Don't run away, Mr. Prime Minister!" one mother said, blocking Mr Chung as he tried to leave. "Please tell us what you're planning to do."
President Park Geun Hye took a boat to the rescue site where she appealed to the dive teams to keep working despite the dangers.
"Time is running out. Please hurry," Ms Park said. "If there are survivors, every minute and second is critical."
The coast guard said 179 people had been rescued - a figure that has remained constant since the evening before, further undermining hopes of more survivors being found.
If the missing are confirmed dead it would become one of South Korea's worst peacetime disasters - all the more traumatic for the number of children involved.
The captain Lee Joon Seok, who survived and was being questioned by investigators, insisted it had not hit any rocks.
Pulling a hood over his head and face as he was surrounded by camera crews in the coastguard offices, Capt Lee mumbled an apology.
"I feel really sorry for the passengers, victims and families," he said.
Distressing mobile phone footage taken by one survivor emerged on Thursday, showing the panic on board with one woman desperately screaming: "The water's coming, the water's coming!"
Rescuers said they feared hundreds had been unable to escape the vessel because of the speed with which it turned over.
Television footage showed terrified passengers wearing life jackets clambering into inflatable boats that pushed right up to the rails of the listing vessel as it sank.
Among the nine confirmed dead were three students, one teacher and a crew member.
If the current toll rises as feared, it could end as the nation's biggest disaster since a Seoul department store collapsed in 1995, killing more than 500 people.