Ballasted

“Its Hywind turbine, mounted on a ballasted vertical steel cylinder that floats upright and is anchored to the seabed, has a unique navigation system developed by Statoil to keep it in the position.” (http://uk.reuters.com/article/2015/07/07/us-statoil-windpower-floating-idUKKCN0PH1ST20150707)

That would be the anchor.

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