These boats suck up massive amounts of sand and redistribute it to create new lands! Via MIT Technology Review:
In 2015 alone, China created the equivalent of nearly two Manhattans of new real estate. In recent years, it constructed two artificial islands to support a 34-mile-long bridge that connects Hong Kong with Macao and the Chinese mainland; it opened in October 2018 and is the world’s longest sea crossing. Much of that work was carried out by state-owned CCCC Dredging, the world’s largest dredging firm. By way of comparison: In 2017, Great Lakes Dredge and Dock, America’s biggest, took in an estimated $600 million from dredging operations. CCCC Dredging booked $7 billion.
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