A wind turbine on a sea jack
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Wind farms: How to transport a giant turbine - sped up

This week, BBC News is taking an in-depth look at offshore wind turbines, and the challenges, costs and construction of these sea giants.

Here, science correspondent David Shukman - with the help of some timelapse footage - explains the tricky operation of getting turbines at Harland and Wolff's dockyard in Belfast, Northern Ireland, ready for their journey out to sea.