The operation to right the Concordia is the biggest maritime salvage exercise ever undertaken with 111 divers working in shifts 24 hours a day from a floating accommodation support vessel tethered next to the wreck.
CNN: Costa Concordia reveals its darkest secrets
2.
"Rogue waves", which had moved so quickly they could not be distinguished from clouds, had crashed across the vessel, finally damaging the accommodation pod and endangering the lives of those on board.