Ninian Central Platform
The Ninian Central Platform is an oil platform in the North Sea. When constructed in Loch Kishorn, Scotland in 1978 the 600,000 tonne platform was the world's largest man-made movable object before being towed to its current position and fixed to the sea floor.
It is a circular concrete gravity structure, 140 m in diameter at its base, with seven concentric walls of stepped heights intersected by radial walls at 45-degree angles. A 14 m wide central shaft is surrounded by a breakwater wall ("Jarlin Wall") 45 m in diameter and 1.6 m thick pierced with 15m diameter holes. Between these two walls drill slots are arranged for drilling up to 42 wells.
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