As the crew members stood with bowed heads before three Gwangju District Court judges, families of the victims struggled to contain their fury.
Many wore yellow ribbons in memory of those killed in the April 16 accident, most of whom were students on a school trip. The crowd erupted when one crew member appeared to smile, and a judge asked the defendants to show respect. The judges also asked the crowd to be quiet.
Because of time constraints today, only 11 of the 15 entered pleas of not guilty. The remaining four are scheduled to appear at a hearing in one week.
All surviving crew members responsible for the ship's navigation have been charged with negligence and with failing to do their duty to protect passengers.
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Several of the defendants acknowledged some responsibility at Tuesday's hearing but denied that they caused the sinking, saying they had little control over the stability of the ferry, which was overloaded with cargo.
The pervading public hostility against the crew has raised questions about the fairness of the trial.
They are being defended by six state-appointed lawyers, three of whom started practicing law only this year. The court said in a statement that it will guarantee the rights of both the defendants and the victims.
Capt Lee Joon-seok and three other crew members are charged with homicide, a charge that could carry the death penalty, though South Korea has not executed anyone since late 1997.