That is a good question, and finding out the answer was surprisingly difficult. At the present time I believe the largest structure currently in existence on the ocean is the Hibernia platform, a huge oil rig in the North Atlantic off the coast of Newfoundland, which has a total weight of about 637,000 tons including the ballast needed to secure it to the bottom of the sea. However, it appears that an experimental platform constructed in Japan to test the idea of floating airports may have been larger. The 2000 experiment resulted in a huge platform, 8.5 hectares in area, constructed over Tokyo Bay which during its existence was the world’s largest floating structure. Because it was only a temporary experiment it was dismantled soon after, and I don’t know if you consider Tokyo Bay to be part of the ocean. Interestingly, in researching this question I also found some claims that the set for the notorious 1995 Hollywood stinker Waterworld, starring Kevin Costner, was at one time the world’s largest floating structure, but that may just be hyperbole.
There is an enormous island of trash floating in the ocean, twice the size of Texas. This might be one of the biggest structures at sea, although its construction was accidental. It’s called the Great Pacific Garbage Patch. See the links below for more info.
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