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.
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Searchers are in a desperate race to find the nearly 300 passengers who may be trapped inside a capsized ferry off the coast of South Korea.
A police chief tells CNN that authorities are working on the assumption that survivors are still in the ship. Divers are trying to find a way inside the ship that is mostly underwater. Their hope is to find students that are still alive - saved by pockets of air.
Time is of the essence with temperatures in the water as cold as 50 degrees, and efforts to pump air into the ship have failed so far because of bad weather..
Tom Foreman has more OutFront.
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It could involve a manned expedition, three miles below the surface of the ocean.
CNN's David Mattingly is inside a manned submersible in Horseshoe Bay in Vancouver to show us what it's like.