SEOUL, South Korea — Soon after the ferry begins to tilt, nervous laughter can be heard from the high school students huddled below deck. In video clips from the cellphone of a victim of a disaster that has shaken South Korea, the teenagers talk of taking selfies, wonder if they’ll make the news and discuss posting about the excitement later on Facebook.

The fear in the cabin builds as the listing becomes worse. Some say they feel dizzy, that their legs are shaking. One student can be seen walking with his hands braced against the wall for balance.

“Am I really going to die?” a student asks at 8:53 a.m. April 16, less than two minutes into the video and two minutes before a crew member on the bridge made the ferry’s first distress call.

Students ask whether the ship will sink and where their teachers are. “What’s the captain doing?”

Several times they are warned over the loudspeaker to stay where they are, even as the tilting increases and it becomes less possible for them to flee. The shaky video was on the cellphone of a 17-year-old student, Park Su-hyeon, when rescuers recovered his body. The boy’s father provided it today to The Associated Press, saying he wanted to show the world the ship’s condition as it sank. Park Jong-dae, the boy’s father, earlier released it to select South Korean media.

The tragedy, which has left more than 300 people dead or missing, has created a sense of national mourning, anger and shame. About 220 bodies, mostly from inside the submerged vessel, have so far been recovered. More than 80 percent of the victims were students from one high school in Ansan, south of Seoul, on their way to the southern tourist island of Jeju for a school trip.

The group of teens in the video alternates between bluster, attempts at humor and unmistakable fear.

Only one can be seen wearing a life jacket at the beginning of the video clips.