But progress in pulling the heavily listing luxury liner to an upright position was going much slower than expected. Delays meant the delicate operation -- originally scheduled from dawn to dusk Monday -- was not expected to be completed before Tuesday morning.
"Things are going like they should, but on a timetable that is dragging out," Franco Gabrielli, head of Italy's Civil Protection Agency, said Monday evening.
Never before has such an enormous cruise ship been righted. Salvage workers struggled to overcome obstacle after obstacle as they slowly inched toward their goal of raising the crippled ship 65 degrees to the upright position.
An early morning storm delayed the salvage command barge from getting into place for several hours. Later, some of the cables dragging the ship's hull upright went slack, forcing engineers to climb the hull to fix them.
The Concordia itself didn't budge for the first three hours after the operation began, engineer Sergio Girotto told reporters.
The initial operation to lift the ship moved it just 3 degrees toward vertical. After 10 hours, the crippled ship had edged upward by just under 13 degrees, a fraction of what had been expected.
Still, the top engineers were staying positive.
"Even if it's 15 to 18 hours, we're OK with that. We are happy with the way things are going," Girotto said.
After some 6,000 tons of force were applied -- using a complex system of pulleys and counterweights -- Girotto said "we saw the detachment" of the ship's hull from the reef thanks to undersea cameras.
At the waterline, a few feet of slime-covered ship that had been underwater slowly became visible.
Thirty-two people died on Jan. 13, 2012, when the Concordia slammed into a reef and toppled half-submerged on its side after coming too close to Giglio Island. The reef sliced a 70-meter-long (230-foot) gash into what is now the exposed side off the hull, letting seawater rush in.
The resulting tilt was so drastic that many lifeboats couldn't be launched. Dozens of the 4,200 passengers and crew were plucked to safety by helicopters or jumped into the sea and swam to shore. The bodies of many of the dead were retrieved inside the ship.
Girotto said the cameras on Monday did not immediately reveal any sign of the two bodies that were never recovered.
Engineers have dismissed as "remote" the possibility that the Concordia might break apart during the salvage operation but set out absorbent barriers to catch any leaks of toxic materials from the ship.
Images transmitted Monday by robotic diving vehicles indicated the submerged side of the cruise ship's hull had suffered "great deformation" from all its time on the granite seabed, battered by waves and compressed under the weight of the ship's 115,000 tons, Girotto said.
Officials said so far no appreciable pollution from inside the ship had spewed out. Giglio Island is part of a Tuscan marine sanctuary where dolphins and fish are plentiful.
The salvage operation, known in nautical parlance as parbuckling, was used on the USS Oklahoma in 1943 after the Japanese attack on Pearl Harbor. But the 300-meter (1,000-foot) Concordia has been described as the largest cruise ship ever to capsize and subsequently require the complex rotation so it can be towed away in one piece and dismantled for scrap.
Engineers used remote controls to guide a synchronized system of pulleys, counterweights and huge chains that were looped under the Concordia's carcass to delicately nudge the ship free from its rocky seabed. A few hours into the operation, four of those cables became slack and threatened to become entangled with other cables, forcing the winching to halt for an hour while workers fixed the problem, Costa engineer Franco Porcellacchia said.
Later in the rotation process, a series of tanks on the exposed side of the hull will be filled with water to help pull it down. That phase should rotate the ship faster than the winching, Porcellacchia said.
Once the ship is upright, engineers hope to attach an equal number of tanks filled with water on the other side to balance the ship, anchor it and stabilize it during the winter months. The flat-keeled hull itself will be resting on a false seabed constructed some 30 meters (100 feet) underwater.
When it comes time to tow the ship away next spring, the tanks will gradually be emptied of the water. That will make the ship buoyant enough to float off the seabed, with the tanks acting like a giant pair of water wings.
Costa Crociere SpA, the Italian unit of Miami-based Carnival Corp., is picking up the tab for the operation, which it estimates so far at 600 million euros ($800 million). Much of that will be passed onto its insurers.
A few dozen island residents gathered Monday on a breakwater to witness the operation. One woman walking her dog sported a T-shirt with "Keep Calm and Watch the Parbuckling Project" written across it in English.
Others watched from afar. Kevin Rebello, whose brother Russel was a waiter on the ship and was never found, said he was in constant touch with the project managers as he monitored news reports.
"I haven't slept since yesterday," he told The Associated Press in an interview in Rome. "It's taken 20 months. If it takes another 20 hours, for me it's worth the wait."
Rebello plans to travel to Giglio Island on Tuesday, even though he knows there's no certainty his brother's remains will be found. His hope is that someday he can bring his brother home to Mumbai "to give him a decent burial.
"That's what me, my family, his wife and all of us are hoping for," he said.
The Concordia's captain is on trial for alleged manslaughter, causing a shipwreck and abandoning the ship during the chaotic and delayed evacuation. Capt. Francesco Schettino claims the reef wasn't on the nautical charts for the liner's weeklong Mediterranean cruise.
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