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Costa Concordia: Watermark shows lift progress

16 September 2013 Last updated at 11:45 BST

One of the largest and most daunting salvage operations ever undertaken is under way with an attempt to pull the shipwrecked Costa Concordia upright.

Footage from the scene shows the difference in colour between the newly-exposed part of the ship, and the part that has been exposed since it hit rocks and capsized in January 2012.

The whole operation is expected to take 12 hours.

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