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How do engineers build oil rigs in the sea?

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Scroll down under types here in Wikipedia Oil platform. You can see that most of the oil platforms touch the bottom of the ocean, so while very deep, they are attached. Therefore they are probably not in the "middle of the ocean" but closer to coastlines where the bottom is attainable. read more

They are normally built in dry docks and then floated out to the location for installation. Water is pumped into the legs to get them to stand up where they want them. read more

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