South Korea's president described the actions of a sunken ferry's crew as "unforgivable" and "murderous" Monday as a prosecutor said that four more crew members had been detained on charges that they had allegedly failed to protect the stricken vessel's passengers. 
 
 South Korean President Park Geun-hye made the comments Monday at a Cabinet briefing, saying that the captain and crew "told the passengers to stay put but they themselves became the first to escape, after deserting the passengers." Park added that "legally and ethically, this is an unimaginable act." 
 
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 Senior prosecutor Ahn Sang-don told reporters Monday that two first mates, one second mate and a chief engineer had been accused of abandoning the ship. Ahn says prosecutors are considering whether to ask a court for a formal arrest warrant that would allow for a longer period of investigation. South Koreans can only be detained for 48 hours without a court-issued formal arrest warrant. The ferry's captain and two other crewmembers were previously formally arrested on suspicion of negligence and abandoning people in need. 
 
 The announcement came as the confirmed death toll from Wednesday's sinking reached 86, with approximately 220 of the ship's 476 passengers, many of them high school students on a holiday trip, still missing. Divers gained access to the ship over the weekend and are expected to find more bodies trapped below decks, where passengers had remained, obeying the captain's initial order not to evacuate the vessel. Efforts to reach the capsized vessel had been thwarted for three days by bad weather and strong currents. 
 
 The pace of recovering bodies has accelerated in recent days, since divers finally succeeded in entering the vessel. 
 
 The discovery of bodies has dashed the faint hopes of some families who have gathered on the island of Jindo, near the site of the wreck. Relatives have been asked to identify their loved ones using the slimmest of clues. Many favored hoodies and track pants. One girl painted her fingernails red and toenails black. Another had braces on her teeth. 
 
 Meanwhile, a newly released transcript shows the ship was crippled by confusion and indecision well after it began listing Wednesday. The transcript suggests that the chaos may have added to a death toll that could eventually exceed 300. 
 
 According to the transcript released by South Korea's coast guard, about 30 minutes after the Sewol began tilting a crew member asked a marine traffic controller whether passengers would be rescued if they abandoned ship off South Korea's southern coast. The crew member posed the question three times in succession. 
 
 That followed several statements from the ship that people aboard could not move and another in which someone said that it was "impossible to broadcast" instructions. 
 
 An unidentified official at Jindo Vessel Traffic Services Center told the crew that they should "go out and let the passengers wear life jackets and put on more clothing." 
 
 "If this ferry evacuates passengers, will you be able to rescue them?" the unidentified crew member asked. 
 
 "At least make them wear life rings and make them escape!" the traffic-center official responded. 
 
 "If this ferry evacuates passengers, will they be rescued right away?" the crew member asked again. 
 
 "Don't let them go bare -- at least make them wear life rings and make them escape," the traffic official repeated. "The rescue of human lives from the Sewol ferry ... the captain should make his own decision and evacuate them. We don't know the situation very well. The captain should make the final decision and decide whether you're going to evacuate passengers or not." 
 
 "I'm not talking about that," the crew member said. "I asked -- if they evacuate now, can they be rescued right away?" 
 
 The traffic official then said patrol boats would arrive in 10 minutes, though another civilian ship was already nearby and had told controllers that it would rescue anyone who went overboard. 
 
 The cause of the disaster is not yet known, but prosecutors have said the ship made a sharp turn before it began to list. 
 
 More than 170 people survived the sinking of the Sewol, which had been on its way from the South Korean port city of Incheon to the southern tourist island of Jeju. The captain took more than half an hour to issue an evacuation order, which several passengers have said they never heard. 
 
 Dozens of relatives have started camping out at the port in Jindo to be closer to where the search was taking place, sleeping in tents in the open. Volunteers provided food and drinks and ran cellphone charging stations. A Buddhist monk in white robes stood facing the water and chanted in a calm monotone as several relatives stood behind him, their hands pressed together and heads bowed in prayer. 
 
 Anguished families, fearful they might be left without even their loved ones' bodies, vented rage Sunday over the government's handling of the crisis. 
 
 About 100 relatives attempted a long protest march to the presidential Blue House in Seoul, about 250 miles to the north, saying they wanted to voice their complaints to President Park Geun-hye. They walked for about six hours before police officers in neon jackets blocked a main road. 
 
 "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," said Lee Woon-geun, father of 17-year-old missing passenger Lee Jung-in. "They are clearly lying and kicking the responsibility to others." 
 
 He said relatives are desperate to retrieve bodies before they decompose beyond recognition. 
 
 "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 Sewol's captain, Lee Joon-seok, 68, was arrested Saturday, along with one of the ship's three helmsmen and the 25-year-old third mate. The third mate was steering at the time of the accident, in a challenging area where she had not steered before, and the captain said he was not on the bridge at the time. 
 
 Senior prosecutor Yang Jung-jin said the third mate has refused to tell investigators why she made the sharp turn. Prosecutors have not named the third mate, but a fellow crew member identified her as Park Han-kyul. 
 
 As he was taken from court in Mokpo on Saturday, the captain explained his decision to wait before ordering an evacuation. 
 
 "At the time, the current was very strong, the temperature of the ocean water was cold," Lee told reporters, describing his fear that passengers, even if they were wearing life jackets, could drift away "and face many other difficulties." 
 
 He said rescue boats had not yet arrived, and there were no civilian vessels nearby. 
 
 The Associated Press contributed to this report. ||||| Media playback is unsupported on your device Media caption A truck driver onboard the ferry tells the BBC how he tried to save passengers 
 
 The confirmed death toll from the South Korean ferry that capsized last week has reached 113, as divers recovered more bodies from the sunken hull. 
 
 Rescuers searching for bodies have been able to take advantage of better weather on Tuesday, officials say, with more than 190 passengers still missing or presumed trapped inside the vessel. 
 
 The ferry tipped over and sank within two hours, but it is not yet clear why. 
 
 The crew have been criticised for allegedly failing to save passengers. 
 
 Five have been charged with not fulfilling their duty to evacuate passengers safely, officials told the South Korean Yonhap news agency. 
 
 At least six other crew members are reported to have been detained. 
 
 As the ship listed passengers were told to remain in rooms and cabins, reports suggest, amid confusion on the bridge over whether to order them to abandon ship. 
 
 The first distress call from the sinking ferry was made by a boy with a shaking voice, officials told Reuters. 
 
 It reported that his plea for help was followed by about 20 other emergency calls from children on board the ship. 
 
 Media playback is unsupported on your device Media caption Jonathan Head: Robot deployed to help lift the sunken hull 
 
 Image copyright Reuters Image caption Many family members and friends of those on board the ferry are still awaiting news of the fate of their loved ones 
 
 Image copyright AP Image caption Teams of divers have been searching the sunken ferry for the bodies of those who died 
 
 Image copyright AP Image caption Bodies are being brought to shore - where many relatives wait for news of their loved ones 
 
 A crew member quoted by local media said that attempts to launch lifeboats were unsuccessful because of the tilt of the ship. Only two of the vessel's 46 lifeboats were reported to have been deployed. 
 
 South Korean President Park Geun-hye on Monday condemned the conduct of some of the crew, calling it "akin to murder". 
 
 The BBC's Jonathan Head in nearby Jindo island says that the rescue operation has now become something of a grim routine, with police boats regularly returning from the scene of the disaster with bodies recovered by military divers. 
 
 Our correspondent says that most of the families of those still missing have accepted that no more survivors will be found. 
 
 Robot ready 
 
 A total of 174 passengers were rescued from the Sewol, which capsized as it sailed from Incheon in the north-west to the southern island of Jeju. 
 
 But there were 476 people on board, including 339 children and teachers on a school trip. Many were trapped inside the ship as it listed to one side and then sank. 
 
 Divers have managed to reach many of the cabins in the hull of the upturned ferry, although they are still trying to get into the ship's restaurant, where they believe many of the passengers were trapped. 
 
 They have also loaded an underwater robot at the port this morning, ready to help in the operation to bring the hull to the surface. 
 
 Crabster robot 
 
 The crabster robot is the size and weight of a Smart car 
 
 It is designed to work up to 200m below the surface in high tidal currents where divers are unable to operate 
 
 A 500m-long cable allows four operators to control the robot from a surface vessel. Data is also fed to the surface via the cable 
 
 It is equipped with 10 optical cameras and a long-range scanning sonar 
 
 Rescue officials say they will keep searching with divers for another two days, but that the families of the victims have agreed that the salvage operation can begin after that. 
 
 Investigations are focusing on whether the ferry took too sharp a turn - perhaps destabilising the vessel - before it started listing and whether an earlier evacuation order could have saved lives. 
 
 Captain Lee Joon-seok was not on the bridge when the ferry began listing. It was being steered by a third mate who had never navigated the waters where the accident occurred, prosecutors say. 
 
 The captain and two other crew members have been charged with negligence of duty and violation of maritime law. Four more crew members were reported to have been detained on Monday and two on Tuesday. 
 
 There were up to 30 crew members on the stricken ship, reports say, and some seven of them are missing. ||||| Jindo, South Korea (CNN) -- Angry relatives of missing South Korean ferry passengers cursed government and police officials Thursday for failing to do enough to save the lives of their loved ones as hopes dim of finding any survivors. 
 
 The relatives berated Fisheries Minister Lee Ju-young and two coast guard officials, accusing them of misleading the public about the operation and of wasting time. 
 
 "How can you fool us into believing you were out there trying to save our children?" one mother yelled at the officials. 
 
 Also, officials at the South Korean headquarters for the task force coordinating the search told CNN that they believe the body of a boy who reportedly made the first emergency call from the ship after it began to list sharply has been recovered. DNA tests will help officially identify the remains, officials said early Friday. 
 
 The ferry Sewol lurched on its side and capsized April 16 with 476 people aboard, including more than 300 high school students on a field trip to the resort island of Jeju. 
 
 The number of confirmed dead rose to 181 on Thursday, with 121 still missing, according to the South Korean coast guard. 
 
 Hopes of finding any survivors in the sunken ferry have all but evaporated following news that divers have found no air pockets on the third and fourth levels of the ship, where many passengers were thought to have been trapped. 
 
 Authorities do not yet know what caused the sinking, but a widening criminal investigation has ensnared the ship's captain and 14 other crew members and led prosecutors to search the offices of the company that owns the ship. 
 
 Authorities also searched the offices of 20 affiliated companies and the home of Yoo Byung-un, the man whose family is believed to be behind the company, looking for any evidence of wrongdoing that could have led to the ship's sinking. 
 
 Among other things, investigators have said they will look into whether modifications to the ship in 2013 could have altered the ship's balance and contributed to what happened. 
 
 Kim Yong-rok, an opposition lawmaker who represents Jindo, an island near where the ship sank, told CNN that modifications to add 117 more passenger cabins to the ship raised the ferry's center of gravity. 
 
 Kim said the work on the ferry took place in 2013 after the Sewol was purchased from a Japanese company. The ferry's passenger capacity was expanded from 804 passengers to 921 passengers, he said. 
 
 South Korean prosecutors were unable to confirm those details for CNN. 
 
 But they are investigating the private organization responsible for inspecting and certifying ships for the South Korean government, which signed off on the work. 
 
 Authorities said they don't yet know precisely what caused the ship to list before it eventually capsized and sank into the ocean on a routine journey from Incheon to the island of Jeju. 
 
 Young crew member hailed as heroine 
 
 In recent disasters, captains didn't hang around 
 
 They say it didn't appear that the ferry was overloaded, according to figures provided by the company and the South Korean coast guard. But coast guard officials said investigators won't know for sure how much cargo the ship was carrying until it is raised from the waters of the Yellow Sea. 
 
 A solemn return to school 
 
 On Thursday, the return to classes at Danwon High School was steeped in grief. 
 
 About two-thirds of the passengers on the Sewol were students at the school in Ansan near Seoul. 
 
 Many of them, from the school's second grade, are dead or missing. Several teachers were also lost in the disaster. 
 
 On Thursday morning, a series of black hearses drove through the school gates. In each one, a person in the passenger seat held a portrait of a dead student. A bus with tinted windows followed behind carrying relatives and friends. 
 
 They were making one last symbolic trip to the school. After the visit, the somber convoys drove on to the students' funerals. 
 
 'I want to see you' 
 
 At the school's entrance stood a makeshift shrine of flowers and food treats. Hundreds of notes held messages to the dead and missing students. 
 
 "Big brother, you have to live, you have to come back." implored one. 
 
 "I want to see you," another said. "I love you and pray for you." 
 
 Many of the messages from other students expressed regret at not being able to help their classmates in their hour of need. 
 
 Thousands of yellow ribbons were tied to the school gates, as well as nearby trees and posts. The ribbons have become symbols of hope that survivors might still be found in the submerged vessel, picking up a practice used in the United States for soldiers and hostages overseas. 
 
 The third-grade students, who are in the final year of high school in South Korea, aren't going back to regular classes. The local health service has provided therapists to speak with the teenagers about grief and loss. 
 
 First-grade students are expected to return next week. It's unclear when the handful of students in the second grade who didn't go on the ill-fated field trip, and those who survived the sinking, will resume classes. 
 
 The students who arrived at the school Thursday had to pass a throng of journalists. Many of them had hoods or caps covering their faces. 
 
 Students remember vice principal who took own life 
 
 Murky waters cloud the horror facing rescue divers 
 
 CNN's Nic Roberston reported from Jindo, South Korea, and CNN's Michael Pearson reported and wrote from Atlanta. CNN's Will Ripley, K.J. Kwon, Andrew Stevens, Steven Jiang, Kyung Lah, Tim Schwarz, Stella Kim and Judy Kwon also contributed to this report.
– Four more crew members on the sunken South Korean ferry were detained today, meaning that all 15 people involved in navigating the doomed boat are now in custody, the AP reports. All of them are accused of negligence and failure to help passengers, 115 of whom are still missing with 187 confirmed dead. But one of those arrested today says he and four other crew members broke windows and saved six passengers who had been stuck in cabins. Of the 174 survivors, 22 are members of the 29-person crew. The seven surviving crew members who were not arrested had non-marine jobs, like chef or steward. The search was suspended today due to weather, but officials say divers have reached two large rooms that may hold many of the dead. Yesterday, divers found 48 bodies crammed in a single cabin. Wrenching stories continue to come out: The body of the boy who first raised the alarm, calling an emergency number to report the ferry sinking, was found Wednesday. His father says the boy did not have time to call his parents after that call, Reuters reports. "I was so angry at the reality that all I can do is look at the sea and pray," he says, "but I am so grateful that he has been found and he is back. ... I am so proud of him." A fisherman who helped save passengers—he estimates he pulled 25 from the water—says he's still haunted by the screams, CNN reports. "It was hell. Agonizing," he says. "There were a lot of people and not enough boats, people in the water yelling for help. The ferry was sinking fast."