At least six people are dead and hundreds are missing after a ferry sank off the southern coast with 462 passengers and crew.
South Korea's coastguard has confirmed 179 have been rescued from the sinking ferry; however, it said hundreds are still unaccounted for.
Coastguards and navy divers have resumed the search for around 280 people still missing in the early hours of Thursday morning.
They will also be seeking answers to many questions surrounding Wednesday's accident, notably what caused the Sewol vessel to list and then flip over entirely, leaving only a small section of its hull above water.
Rescue efforts on Thursday could be be hampered by difficult weather conditions, amid forecasts of rain, strong winds and fog.
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