Shell Prelude floating facility
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World's biggest 'ship' takes to water

The world's biggest floating facility, which will produce natural gas from 2017, has taken to the water for the first time.

When fully built, Shell's Prelude will weigh over 600,000 tonnes.

Captain John Konrad, editor in chief of gCaptain.com, explains to BBC Radio 5 live's Up All Night what makes the huge vessel unique.

Footage provided by Shell.