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See how Costa Concordia cruise ship will float for first time after crash

Workers are beginning the re-floating process of the Costa Concordia, the cruise ship that slammed into a reef off the coast of Italy in January 2012. 

But how?

It's the most daunting and expensive maritime salvage in history, costing more than $1 billion. 

Watch: Costa Concordia re-float effort underway 

Thirty giant steel tanks filled with water have kept the Concordia stable on artificial underwater platforms.

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Compressed air will be pumped in, giving the ship the buoyancy it needs to stay afloat.

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After it's raised by two meters, the ship will be moved away from the cliff before refloating can continue.

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Officials say this operation will last one week before the ship will be towed away for its last journey to the scrapyard. 

Follow Claudio Lavanga on Twitter. 

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