South Korea's prime minister resigned Sunday over the sinking of a passenger ferry that left more than 300 people dead or missing, amid huge public anger over what is seen as a bungled response to the tragedy.
Chung Hong-Won admitted he had not been up to the task of overseeing rescue operations after the Sewol capsized with 476 people -- many of them schoolchildren -- on board.
"I offer my apology for having been unable to prevent this accident from happening and unable to properly respond to it afterwards," he said.
"I believed I, as the prime minister, certainly had to take responsibility and resign."
Parents and relatives of the missing and the dead have blasted the response to the sinking, saying the rescue operation was too slow to swing into action, possibly costing lives.
There has also been rage over perceived corruption and lax safety standards that may have led to the disaster, with claims that the ferry was overloaded and the passenger list was inaccurate and incomplete.
"The latest accident left all South Koreans in great shock and sorrow. (Many) days have passed since the accident, but the screams of families of the missing still keep me up at night," Chung told a nationally-televised press conference.
"I sincerely hope that South Koreans and families of the Sewol victims will forgive and understand me for being unable to fulfil my obligations until the end. I beg you once again to rally support (for rescue operations)."
- Grim search for bodies -
The confirmed death toll from the tragedy stood Sunday at 187, with 115 unaccounted for, their bodies believed trapped in the sunken vessel.
Divers were battling decompression sickness and atrocious weather in their grim search for corpses.
Further complicating their efforts was the increasing depth of the wreck as it sinks slowly into the silt of the seabed, making an already dangerous diving operation even more hazardous.
Despite waves up to three metres (nine feet) tall and near gale-force winds, teams were still trying to search the ferry.
A coastguard spokesman said 98 frogmen would be trying to get into rooms on the fourth deck of the 6,825 tonne Sewol, but he warned the worsening conditions were making things hard.
"A growing number of divers are reporting decompression sickness," he said. "We are trying our best to make progress in these difficult weather conditions."
"As the ship has sunk further... the diving depth also increased to more than 40 metres (130 feet), posing even more difficulties for search efforts."
Pressure rises as divers go deeper, increasing the amount of air they breathe from their tanks.
This not only reduces dive time, but also heightens levels of nitrogen in their bloodstream, raising the risk of potentially harmful bubbles forming in body tissue. This decompression sickness, which is also known as "the bends", can cause long-term health problems.
Although all hope of finding survivors has been extinguished, there is still anger and deep frustration among relatives of the missing over the pace of the recovery operation.
It took divers two days to get inside the ferry after it sank, and a further two days to bring up the first bodies.
Strong underwater currents, poor visibility and the presence of debris makes the operation as difficult as it is harrowing.
One room they were able to access earlier in the week contained the bodies of 48 young students, all wearing life jackets.
- All crew in custody -
On the surface, recriminations continue, with four more of the ship's crew arrested on Saturday.
Their arrests mean all 15 surviving crew members responsible for sailing the vessel were in custody, facing charges ranging from criminal negligence to abandoning passengers.
Prosecutors have also raided a host of businesses affiliated with the ferry operator, the Chonghaejin Marine Company, as part of an overall probe into corrupt management.
The widening investigation has seen travel bans put on eight current and former executives of the Korea Register of Shipping -- the body responsible for issuing marine safety certificates.
Around a quarter of the dead recovered so far have been found in waters outside the sunken vessel, and there are fears that some of the missing may have drifted free from the wreck.
Authorities have installed 13-kilometre-long (eight-mile-long) nets anchored to the seabed across the Maenggol sea channel to prevent the dead being swept into the open ocean.
Dozens of other vessels and helicopters have been scouring the site and beyond, with the search operation expanded up to 60 kilometres from the scene of the disaster, while coastal areas and nearby islands will also be searched.