Non veni pacem mittere, sed gladium.
And all of concrete.
Hibernia, off Newfoundland is heavier.Hibernia is an oil field in the North Atlantic Ocean, approximately 315 kilometres (196 mi) east-southeast of St. John's, Newfoundland, Canada, in 80 m of water.:35–36The production platform Hibernia is the world's largest oil platform (by weight) and consists of a 37,000 t (41,000 short tons) integrated topsides facility mounted on a 600,000 t (660,000 short tons) gravity base structure. The platform was towed to its final site, and 450,000 t (500,000 short tons) of solid ballast were added to secure it in place. Inside the gravity base structure are storage tanks for 1.3 million barrels (210,000 m3) of crude oil
Katie Melua made a concert at the bottom of one of legs:https://www.youtube.com/watch?v=o5Wrk7GRiS4