South Korean President Park Geun-hye yesterday said the actions of some crew of a ferry that sank with hundreds feared dead were tantamount to murder, as a four-year-old video transcript showed the captain promoting the safety of the same route.

Sixty-four people are known to have died and 238 are missing, presumed dead, in the sinking of the Sewol ferry last Wednesday. Most of the victims are high school children.

Captain Lee Joon-seok, 69, and two other crew members were arrested last week on negligence charges, with prosecutors announcing four further arrests – two first mates, one second mate and a chief engineer – yesterday.

Lee was also charged with undertaking an “excessive change of course without slowing down” while traversing a narrow channel.

Several crew members, including the captain, left the ferry as it was sinking, ahead of the passengers, witnesses have said.

Park said the crew’s desertion was tantamount to murder.

“Above all, the conduct of the captain and some crew members is unfathomable from the viewpoint of common sense, and it was like an act of murder that cannot and should not be tolerated,” she told aides.

Lee, the captain, said in a promotional video four years ago that the journey from the port city of Incheon to the holiday island of Jeju was safe – as long as passengers followed the instructions of the crew.

He also told a newspaper that he had been involved in a sea accident off Japan years before.

The irony of the video is the crew ordered the passengers to stay put in their cabins as the ferry sank. As is customary in hierarchical Korean society, the orders were not questioned. However, many of those who escaped alive either did not hear or flouted the instructions and were rescued as they abandoned ship.

Of the 476 passengers and crew on board, 339 were children and teachers on a high school outing.

Parents of the children missing in the accident in what is likely to turn out to be one of South Korea’s worst maritime disasters sat exhausted from days of grief yesterday, waiting for the almost inevitable news that their loved ones had died. They have spent all their time since the accident in a gymnasium in the port city of Jindo, taking it in turns to vent their anger at the crew’s inaction and slow pace of the rescue operation.

Divers are retrieving the bodies at a faster pace and some parents have moved from the gymnasium to the pier to await news.

Others stay put on their mattresses in the gym, where one by one, parents are informed that a body matches a family DNA swab, prompting wailing and collapses.

Two US underwater drones have been deployed in the search for bodies, a coastguard official said. Strong tides hampered operations overnight but the weather was better yesterday.

A clearer picture has started to emerge of the time around the accident after coastguards released a recording of a conversation between vessel controllers and the ship.

Witnesses have said the Sewol turned sharply before it began listing. It took more than two hours for it to capsize completely but passengers were ordered to stay put in their cabins.

According to the transcript, the controllers told the captain to “decide how best to evacuate the passengers” and that he should “make the final decision on whether or not to evacuate”.

Lee was not on the bridge when the ship turned. Navigation was in the hands of a 26-year-old third mate who was in charge for the first time on that part of the journey, according to crew members.

The transcript shows crew on the ship worried there were not enough rescue boats to take all the passengers. Witnesses said the captain and some crew members took to rescue boats before the passengers.

Lee said earlier he feared that passengers would be swept away by the ferocious currents if they leapt into the sea. He has not explained why he left the vessel.

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.