At San Onofre, each one stands 65 feet high, weighs 1.3 million pounds and has 9, 727 U-shaped tubes inside, each 0.75 inch in diameter.

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This vortex would be produced inside a large cylindrical wall, 200 metres in diameter and 100 metres tall.

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Everything fits inside a space that's about 10cm high and 19cm in diameter.

ENGADGET

Inside the riser pipe is a space about half a meter in diameter, large enough to hold the spinning drill pipe and bit and to allow the return flow of drilling fluid.

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