An aerial view shows the Costa Concordia as it lies on its side next to Giglio Island taken from an Italian navy helicopter August 26, 2013. The wrecked Costa Concordia cruise ship could be upright again next week, nearly two years after the liner capsized and killed at least 30 people off the Italian coast. The giant vessel, which has lain partly submerged in shallow waters off the Tuscan island of Giglio since the accident in January 2012, will be rolled off the seabed and onto underwater platforms. Picture taken August 26, 2013. (ITALY - Tags: MARITIME DISASTER TRANSPORT) FOR BEST QUALITY IMAGE SEE:GM1E9AE1LQF01 

A seagull flies past the side of the cruise liner Costa Concordia during the "parbuckling" operation outside Giglio harbour January 12, 2014. Thirty massive tanks filled with air will lift the hulk of the Costa Concordia off the seabed in June so it can be towed away from the Italian island of Giglio where it capsized two years ago, officials said. The 114,500-tonne vessel hit rocks on Jan. 13, 2012, killing 32 people. It was hauled upright in a complex "parbuckling" operation in September but still rests where it capsized, just outside the holiday island's small port. Refloating the Concordia will be one more phase in the largest maritime salvage in history. Where the ship will be dismantled - the final step - has yet to be decided. REUTERS/Max Rossi (ITALY - Tags: DISASTER MARITIME TRANSPORT TPX IMAGES OF THE DAY ANIMALS) 

The Costa Concordia cruise liner is seen during its refloat operation at Giglio harbour July 22, 2014. The massive hulk of the Costa Concordia is nearly ready to be towed away from the Italian island where it struck a rock and capsized two-and-a-half years ago, killing 32 people, officials said on Sunday. The 114,500-tonne Concordia has been slowly lifted from the sea floor since Monday, when salvagers began pumping air into 30 large metal boxes, or sponsons, attached around the hull. A convoy of 14 vessels will then tow the Concordia to a port near Genoa, where it will be broken up for scrap, completing one of the biggest maritime salvage operations in history. REUTERS/Max Rossi (ITALY - Tags: DISASTER MARITIME TPX IMAGES OF THE DAY) 

A boy prepares to snorkel in front of the wreckage of capsized cruise liner Costa Concordia, near the harbour of Giglio Porto August 28, 2012. Tourists on the Tuscan coast were taking part in a rather macabre form of sightseeing -- taking boat trips to view the wreckage of shipwrecked cruise liner Costa Concordia, where 32 people lost their lives after it hit rocks on January 13.
REUTERS/Alessandro Bianchi (ITALY - Tags: DISASTER TRAVEL MARITIME TPX IMAGES OF THE DAY) 

A lightning storm is pictured over the sea near the capsized cruise liner Costa Concordia, surrounded by cranes, outside Giglio harbour September 15, 2013. REUTERS/Tony Gentile (ITALY - Tags: DISASTER MARITIME ENVIRONMENT) 

The Costa Concordia cruise ship which ran aground off the west coast of Italy at Giglio island lies on its side, half-submerged and threatening to slide into deeper waters January 23, 2012. The operators of the Costa Concordia faced questions over their share of the blame for the shipwreck, as divers recovered another body from the stricken liner on Sunday, bringing the known death toll to 13. REUTERS/Tony Gentile (ITALY - Tags: DISASTER TRANSPORT) 

Relatives of victims cry as they stand on a ferry during a ceremony to commemorate the first anniversary of the Costa Concordia shipwreck, in which 32 people died, outside Giglio harbour January 13, 2013. REUTERS/Tony Gentile (ITALY - Tags: DISASTER MARITIME ANNIVERSARY) 

A firefighter helicopter flies over the Costa Concordia cruise ship after it ran aground off the west coast of Italy at Giglio island January 19, 2012. No deadline has been set for ending the search for missing people on the wreck of the Italian cruise liner that capsized off the Tuscan island, the chief spokesman of the firefighters said on Thursday. REUTERS/Paul Hanna (ITALY - Tags: DISASTER TRANSPORT) 

A bench engraved with the name of the grounded Costa Concordia cruise ship (seen at rear) is seen washed up on the shore of Giglio island, January 20, 2012. Italian rescue workers suspended their search of the capsized Italian cruise liner after the ship moved again on Friday, firefighters' spokesman Luca Cari said. REUTERS/Paul Hanna (ITALY - Tags: DISASTER MARITIME TRANSPORT TPX IMAGES OF THE DAY) 

Captain of the Costa Concordia cruise liner Francesco Schettino prepares to read a speech during his trial in Grosseto February 11, 2015. An Italian prosecutor has asked a court to sentence Schettino to more than 26 years in jail for his role in the 2012 disaster that killed 32 people. The defence is expected to respond in court starting February 9, with a verdict expected thereafter. REUTERS/Max Rossi (ITALY - Tags: DISASTER MARITIME CRIME LAW) 

The cruise liner Costa Concordia is seen during the refloat operation at Giglio harbour at Giglio Island July 21, 2014. Technicians on July 14, 2014 began a complex operation to refloat and tow away the wreck of the Costa Concordia, two and a half years after the luxury liner capsized off the Italian coast, killing 32 people. REUTERS/Alessandro Bianchi (ITALY - Tags: DISASTER TRANSPORT TPX IMAGES OF THE DAY) 

People sunbathe as the Costa Concordia cruise liner is seen during its refloating operation at Giglio harbour July 21, 2014. The massive hulk of the Costa Concordia is nearly ready to be towed away from the Italian island where it struck a rock and capsized two-and-a-half years ago, killing 32 people, officials said on Sunday. REUTERS/Giampiero Sposito (ITALY - Tags: DISASTER MARITIME TPX IMAGES OF THE DAY) 

An aerial view shows the Costa Concordia as it lies on its side next to Giglio Island taken from an Italian navy helicopter August 26, 2013. The wrecked Costa Concordia cruise ship could be upright again next week, nearly two years after the liner capsized and killed at least 30 people off the Italian coast. The giant vessel, which has lain partly submerged in shallow waters off the Tuscan island of Giglio since the accident in January 2012, will be rolled off the seabed and onto underwater platforms. Picture taken August 26, 2013. REUTERS/Alessandro Bianchi (ITALY - Tags: TRANSPORT MARITIME DISASTER) 

The cruise liner Costa Concordia is seen during a refloat operation at Giglio harbour at Giglio Island July 14, 2014. Technicians on Monday began a complex operation to refloat and tow away the wreck of the Costa Concordia, two and a half years after the luxury liner capsized off the Italian coast, killing 32 people. REUTERS/Alessandro Bianchi (ITALY - Tags: DISASTER TRANSPORT) 

An aerial view shows the Costa Concordia as it lies on its side next to Giglio Island taken from an Italian navy helicopter August 26, 2013. The wrecked Costa Concordia cruise ship could be upright again next week, nearly two years after the liner capsized and killed at least 30 people off the Italian coast. The giant vessel, which has lain partly submerged in shallow waters off the Tuscan island of Giglio since the accident in January 2012, will be rolled off the seabed and onto underwater platforms. Picture taken August 26, 2013. REUTERS/Alessandro Bianchi (ITALY - Tags: TRANSPORT MARITIME DISASTER) 

Tourists take a pictures from a ferry boat of the capsized cruise liner Costa Concordia as they arrive outside Giglio harbour July 13, 2014. The refloat operation for Costa Concordia is expected to begin on July 14 and be completed on July 21. REUTERS/Alessandro Bianchi (ITALY - Tags: DISASTER TRAVEL TRANSPORT) 

People dive in front of the cruise liner Costa Concordia at Giglio harbour, Giglio Island July 13, 2014. Italian authorities gave the green light to refloating the wrecked Costa Concordia cruise ship on Saturday, setting the stage for the next step in the largest maritime salvage in history to begin on Monday morning. The defunct luxury liner is due to depart Giglio on July 21, two and a half years after it struck a reef while performing a display manoeuvre to move close to shore and "salute" the port. REUTERS/Alessandro Bianchi (ITALY - Tags: DISASTER TRANSPORT MARITIME TPX IMAGES OF THE DAY) 

An aerial view shows the Costa Concordia as it lies on its side next to Giglio Island taken from an Italian navy helicopter August 26, 2013. The wrecked Costa Concordia cruise ship could be upright again next week, nearly two years after the liner capsized and killed at least 30 people off the Italian coast. The giant vessel, which has lain partly submerged in shallow waters off the Tuscan island of Giglio since the accident in January 2012, will be rolled off the seabed and onto underwater platforms. Picture taken August 26, 2013. REUTERS/Alessandro Bianchi (ITALY - Tags: TRANSPORT MARITIME DISASTER) 

A RHIB (Rigid-hulled inflatable boat) of the firefighters' diving unit goes past the slide and pool area of the cruise liner Costa Concordia, which ran aground off the west coast of Italy, at Giglio island January 28, 2012. Salvage crews preparing to pump thousands of tonnes of diesel fuel and oil from the wreck of the Costa Concordia cruise ship off the Italian coast suspended work on Saturday because of bad weather that could last into next week, officials said. REUTERS/Darrin Zammit Lupi (ITALY - Tags: DISASTER TRANSPORT MARITIME)