Anguished relatives of missing South Korean ferry passengers waited sullenly for answers Thursday as rescuers fought bad weather, murky water, darkness and time to find a way deep into the capsized ship.

Authorities believe 287 people - many of them high school students on a field trip - remain trapped inside the five-story ship. At least some, authorities say, could still be alive more than a day after the ship rolled over.

Meanwhile, the ferry's captain is facing mounting questions about the incident.

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