The stricken Costa Concordia cruise liner could be upright again next week, nearly two years after she capsized on the rocky shore of the Tuscan island of Giglio.

Assuming seas are calm, the 114,500-ton ship will be raised on Monday morning in a procedure that could take 12 hours. The $800-million refloating is considered to be one of the largest, most expensive and most daunting salvage operation in history.

PHOTOS: Raising the Concordia

"This is an operation that has never been attempted before. Once started, there is no going back,” Franco Gabrielli, head of the civil protection agency said on Thursday at a press conference.

The Concordia struck a rock and capsized on Jan. 13, 2012, after captain Francesco Schettino allegedly drove it on an unauthorized route too close to shore, ripping a huge gash in the hull. The ship claimed 32 lives as it tumbled onto its side with more than 4,200 people aboard.

The U.S. company Titan Salvage and Italian marine firm Micoperi, the companies engaged in the salvage operation, have first secured and stabilized the rusting wreck, which was lying dangerously on two spurs of rock just off land. In order to prevent any slipping or sinking, anchor blocks tied to the sea bed and giant cement sacks to fill the space between the two spurs of rock have been used.

The operation also relies on underwater platforms on the seaward side of the ship and on watertight boxes, or caissons, which have been placed to the side of the ship that sits above water.

The 65-degree rotation will be performed using jacks. These will be tightening several cables attached to the top of the caissons and to the platforms, which will be pulled seaward.

On the other side, cables attached to the land will ensure the ship does not slide off the platform.

“This is a very delicate phase, during which the forces involved have to be offset carefully to rotate the wreck without deforming the hull,” Titan said.

It's estimated the ship will rotate at about 10 feet per hour.

Filled with water, the caissons will help pull the ship upright.

Eight Unbelievable Cruise Ship Disasters

"When the ship is upright, another 15 caissons will be fixed to the other side of the hull to stabilize it," the U.S. company said. “A pneumatic system will be used to empty the water gradually from the caissons on both sides of the wreck, giving the sufficient shove to push it upwards."

At the end of the emptying process, the Concordia will be upright, although a section of about 60 feet will remain submerged.

Sandwiched between the caissons, the ship will then be towed to an Italian port for dismantling in spring 2014.

“The rotation is the most risky and delicate phase of the operation," Gabrielli said. "However, we consider the possibility that the ship falls apart a remote event."

Nick Sloane, a South-African salvage master hired by the Titan Salvage and Micoperi to lead the removal operation confirmed that the Concordia will suffer an “extreme amount of force” of compression in the first part of the rotating maneuver.

“Once the ship moves upward some 25 degrees, gravity will take over,” Sloane said. At that point, we'll start feeling relief."

Gabrielli also admitted that furniture and other materials, which are now inside the ship, will be poured into the sea as the ship is rolled over. He also stressed that once the ship is floating again, it will be a priority to recover the two missing bodies that are most likely still trapped inside.

During the parbuckling operation, Giglio will be off limits: Authorities will let one last ferry sail from the island at dawn on Monday, while no other ferries or boats will be allowed until the historic effort is over.