We should probably know that Eiffel Tower, Empire State Building, Sears Tower, etc as one of high rise building on earth. That building was built on upland or onshore, but actually there also tall building that built on the sea floor.
The offshore oil platform building structures is begin with Forties (128 m), then Magnus in the North Sea (186 m), Cognac in Gulf of Mexico (312 m), and Bullwingkle (492 m) to be compared with onshore building strucutres such as Eiffel Tower (300 m), Sears Tower (443 m) and CN Toronto Tower (553 m).
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