By Eric Sylvers 

MILAN--More than two years after it ran aground off the Tuscan island of Giglio, the Costa Concordia is just a few days away from finally being towed to shore, where it will be dismantled and scrapped.

If the weather cooperates, the massive ship, which is more than three football fields long and has 13 decks, will on Monday or Tuesday begin its four-day journey to Genoa on Italy's northwest coast. More than 350 engineers, divers and other specialists are working to stabilize and move the Concordia, an operation that has so far cost Costa Crociere, the Carnival Corp. unit that owns the ship, more than $1.2 billion. After adding the cost to clean the local area, the trip to Genoa and the dismantling, the bill could top $2 billion.

Salvage workers this week detached the ship from the steel platform on the ocean floor upon which it was resting. That set the Concordia afloat for the first time since it ran into rocks in January 2012 after sailing too close to the island in what was supposed to be a spectacle for cruise ship travelers. The accident killed 32 people.

In the past few days workers also secured chains to the Concordia to strengthen its bottom, filled 30 large metal boxes attached to the ship with compressed air to lift it from the seabed, and moved it about 100 feet from the shore.

"For the first time we have total control of the ship, that is a milestone for us," Franco Porcellacchia, Costa Crociere's project manager in Giglio, said in an interview. "The trip to Genoa doesn't worry us too much as it is certainly not one of the most delicate parts of this operation. We picked the best possible route factoring in safety and protection of the environment."

The route to Genoa, about 200 nautical miles, will see the Concordia pass between the Tuscan archipelago and the island of Corsica, though well clear of French waters. Ségolène Royal, the French energy and environment minister, on Wednesday asked the Italian government to guarantee there will be no environmental risks to the French island.

The convoy accompanying the Concordia will involve about a dozen ships, including two tug boats towing from the front and a pontoon with a 200-ton crane. The convoy will be led by a marine mammals-watching vessel ready to order the Concordia to slow down if animals are spotted. There will also be vessels nearby to clean up in case any of the fuel left in the Concordia leaks and Italian navy ships to help keep any curious sailors at a distance.

After a heated, monthslong battle, Genoa won the rich bid to scrap the hulking boat, beating other Italian ports such as Piombino and Civitavecchia, which are closer to where the ship sank. Italian authorities insisted the Concordia be moved intact to port before the dismantling, thus minimizing environmental risks near Giglio. But that doubled the time and cost of the salvage operation, now one of the largest and most expensive at sea in history.

It will take almost two years to dismantle the Concordia in Genoa, an undertaking that will be led by oil services company Saipem, a unit of Italian oil giant Eni, while the cleaning, restoration and monitoring of the seabed where the ship has sat will continue for five years, according to Costa Crociere.

In the months after the sinking, salvage workers extracted about 95% of the fuel, 250 cubic meters of trash and sewage, and 24 metric tons of material, but there is still plenty left on the ship including pianos, furniture, broken plates, electronic devices and the personal effects of the passengers.

More than 4,000 passengers and crew were aboard the ship when it sank. One body has still not been recovered from the wreckage.

In a delicate operation in September, engineers righted the Concordia and eased it onto the underwater platform. Since that maneuver, known as parbuckling, crews stabilized the ship, made repairs on the side that received the gash and drained tons of water so the Concordia would be fit to sustain the journey to Genoa.

The salvage operation is being carried out by Titan-Micoperi, a joint venture between Titan Salvage, a U.S. company owned by Crowley Maritime Group, and Micoperi, an Italian company specializing in engineering and installation of offshore structures and undersea pipelines.

Francesco Schettino, the Concordia captain at the time of the sinking, is on trial and faces up to 20 years in prison if convicted of causing the shipwreck, manslaughter and abandoning ship. He is fighting the charges and has argued that his navigational skills mitigated what could have been a worse disaster. While he doesn't dispute that he left the ship well before hundreds of passengers, he argues he did it to be better positioned to help in the rescue operation. That the ship was far off its predetermined course when it struck the submerged rocks isn't in dispute.

Write to Eric Sylvers at eric.sylvers@wsj.com

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