MOKPO, South Korea (AP) — The confirmed death toll from South Korea's ferry disaster rose past 50 on Sunday as divers finally found a way inside the sunken vessel, quickly discovering more than a dozen bodies in what almost certainly is just the beginning of a massive and grim recovery effort.

About 250 people are still missing from the ship, which had been packed with high school students on a holiday trip, and anguished families are furious with the pace of rescue efforts. Divers had previously failed to enter the ferry, officials said, because of extremely strong currents and bad visibility due to foul weather.

Beginning late Saturday, when divers broke a window, and continuing into Sunday, multiple teams of divers have found various routes into the ferry, discovering bodies in different spots, coast guard official Koh Myung-seok said at a briefing. Thirteen bodies have been found in the ship, while six other bodies were found floating outside Sunday, bringing the official death toll to 52.

At least 23 of the dead are students, according to coast guard spokesman Kim Jae-in. Divers have yet to find any survivors in the ship.

A 21-year-old South Korean sailor, surnamed Cho, also died from injuries he sustained Wednesday while working on a warship going to help rescue passengers in the ferry, said Cmdr. Yim Myung-soo of the South Korean navy.

The penetration by divers into the ferry follows the arrest of the captain Saturday on suspicion of negligence and abandoning people in need. Two crew members also were taken into custody, including a rookie third mate who a prosecutor said was steering in challenging waters unfamiliar to her when the accident occurred.

Meanwhile, on an island near the submerged ferry, about 200 police in neon jackets blocked about 100 relatives of missing passengers who'd been walking on a main road in an effort, they said, to travel to the presidential Blue House in Seoul to voice their complaints to the president.

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"The government is the killer," they shouted as they pushed against a police barricade.

"We want an answer from the person in charge about why orders are not going through and nothing is being done," Lee Woon-geun, father of missing passenger Lee Jung-in, 17, said. "They are clearly lying and kicking the responsibility to others."

Prime Minister Chung Hong-won on Sunday visited the gymnasium where relatives of the ferry's missing passengers have been staying, but he met only with a number of representatives of the family members in a side office. The representatives were to brief other relatives about the meeting later.

Relatives are desperate to retrieve bodies before they decompose beyond recognition, Lee said.

"After four or five days the body starts to decay. When it's decayed, if you try to hold a hand it might fall off," he said. "I miss my son. I'm really afraid I might not get to find his body."

The ferry's captain, Lee Joon-seok, 68, was arrested along with one of the Sewol's three helmsmen and the 25-year-old third mate, prosecutors said.

Lee, speaking to reporters Saturday morning as he left the Mokpo Branch of Gwangju District Court to be jailed, defended his much-criticized decision to wait about 30 minutes before ordering an evacuation.

"At the time, the current was very strong, the temperature of the ocean water was cold, and I thought that if people left the ferry without (proper) judgment, if they were not wearing a life jacket, and even if they were, they would drift away and face many other difficulties," Lee said. "The rescue boats had not arrived yet, nor were there any civilian fishing ships or other boats nearby at that time."

The Sewol had left the northwestern port of Incheon on Tuesday with 476 passengers on an overnight journey to the holiday island of Jeju in the south, including 323 students from Danwon High School in Ansan. It capsized within hours of the crew making a distress call to the shore a little before 9 a.m. Wednesday. Most of the missing passengers are believed to be trapped inside the 6,852-ton vessel.

With the chances of survival increasingly slim, it is shaping up to be one of South Korea's worst disasters. The loss is more keenly felt because of so many young people, aged 16 or 17, on board. The country's last major ferry disaster was in 1993, when 292 people were killed.

By the time the evacuation order was issued, the ship was listing at too steep an angle for many people to escape the tight hallways and stairs inside. Several survivors told The Associated Press that they never heard any evacuation order.

Senior prosecutor Yang Jung-jin told reporters that the third mate was steering the ship Wednesday morning as it passed through an area with lots of islands clustered close together and fast currents. According to investigators, the accident came at a point where the ship had to make a turn. Prosecutor Park Jae-eok said investigators were looking at whether the third mate ordered a turn so sharp that it caused the vessel to list.

Yang said the third mate has six months of experience, and hadn't steered in the area before because another mate usually handles those duties. She took the wheel this time because heavy fog caused a departure delay, Yang said, adding that investigators do not know whether the ship was going faster than usual.

Helmsman Park Kyung-nam identified the third mate as Park Han-kyul. The helmsman who was arrested, 55-year-old Cho Joon-ki, spoke to reporters outside court and accepted some responsibility.

"There was a mistake on my part as well, but the steering had been turned much more than usual," Cho said.

Lee has four decades of experience at sea. A representative for his employer, Chonghaejin Marine Co. Ltd., told Yonhap News Agency that he has sailed the company's route from Incheon, near Seoul, to the southern island of Jeju for eight years.

But he was not the Sewol's main captain, and worked on the ship about 10 days a month, helmsman Oh Yong-seok said.

Lee was not on the bridge when the ship began to list. "I gave instructions on the route, then briefly went to the bedroom when it happened," he told reporters.

According to the court, Lee faces five charges, including negligence of duty and violation of maritime law, and the two other crew members each face three related charges.

Lee was required by law to be on the bridge helping his crew when the ferry passed through tough-to-navigate areas, said Yang, the senior prosecutor.

Yang said Lee also abandoned people in need of help and rescue, saying, "The captain escaped before the passengers." Video aired by Yonhap showed Lee among the first people to reach the shore by rescue boat.

Yang said the two crew members arrested failed to reduce speed near the islands and failed to carry out necessary measures to save lives.

It's not clear why the two crew members made the sharp turn, Yang said. He said prosecutors would continue to look into whether something other than the turn could have made the ferry sink, but he added that there were no strong waves that could have knocked down the ferry at the time.

Prosecutors will have 10 days to decide whether to indict the captain and crew, but can request a 10-day extension from the court.

Three vessels with cranes arrived at the accident site to prepare to salvage the ferry, but they will not hoist the ship before getting approval from family members of those still believed inside because the lifting could endanger any survivors, said a coast guard officer, speaking on condition of anonymity, citing department rules.

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Klug reported from Seoul. Associated Press writers Youkyung Lee and Jung-yoon Choi in Seoul and Gillian Wong in Jindo, South Korea, contributed to this report.