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Jindo, South Korea (CNN) - Anguished relatives of missing South Korean ferry passengers waited for answers Thursday as rescuers fought bad weather, murky water, darkness and time to find a way deep into the capsized ship.
Authorities believe 276 people - many of them high school students on a field trip - may 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.
Among other things, authorities are investigating the possibility the ship was off course when it ran into trouble, reports that few of its lifeboats made it into the water and reports that the captain was among the first to escape, according to Kim Soo Hyeon, the chief of South Korea's Yellow Sea Maritime Police Agency.
Under South Korean maritime law, the captain is supposed to stay with the ship, CNN's Kyung Lah reports.