A desperate race is under way off the coast of South Korea to save nearly 300 people, most of them students trapped in what authorities hope are isolated air pockets inside the overturned ferry.
Authorities are working on the assumption that survivors are still in the ship - but bad weather, murky water and darkness have hindered the rescue operation.
On land, the South Korean government is under increasing pressure to determine what caused the crash that has killed at least 25 people.
Officials say it appears the ship may have veered off course, though they say it does not appear to have hit a rock.
The captain of the ship, meanwhile, is under investigation.
Kyung Lah is OutFront in Jindo, South Korea with the latest in the investigation.