The salvaging operation began after hours of preparations and tests, according to an official from the Ministry of Oceans and Fisheries who didn't want to be identified because of office rules.
Workers on two barges have slipped 66 cables beneath the Sewol ferry, which had been lying on its left side in about 40 meters (130 feet) of water. The cables are connected to a frame of metal beams divers have spent months putting in place.
Workers will then begin loading it onto a semi-submersible, heavy-lift vessel that will carry it to a mainland port. That process, including emptying the ferry of water and fuel, is expected to take days.
Workers also conducted tests to raise the ferry on Sunday, but delayed the operation after some cables became tangled.
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The bodies of 295 passengers most of whom were students on a high school trip were recovered after the sinking on April 16, 2014, but nine are still missing. Relatives are hoping that those remains will be found inside the ferry.
The ferry's captain survived and is serving a life sentence after a court found him guilty of committing homicide through "willful negligence" because he fled the ship without issuing an evacuation order.
Park was forced to defend herself against accusations that she was out of contact for several hours on the day of the sinking. The allegations were included in an impeachment bill lawmakers passed against Park in December, amid broader corruption suspicions.
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