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These are the first four sponsons, P9 through P12, which have been attached to the port side of the Costa Concordia shipwreck at the Island of Giglio. The first two sponsons, also known as caissons, were attached to the ship in April, and this week two more were added.
The sponsons, built by Fincantieri, are large watertight boxes made of steel that will provide leverage during the parbuckling, and then emptied to provide for flotation. Another 7 sponsons still need be positioned prior to uprighting the ship in early September and, in total, 15 sponsons will be installed to each side of the ship before refloating.
More about the Costa Concordia salvage here.
Photos courtesy of Giglio facebook page