We take apart the GPO Amethyst, an ocean transporter capable of carrying some of the largest structures by deliberately sinking into the ocean. Superstructures: Engineering Marvels | S1, E2 Explore the World with National Geographic subscriptions: http://natgeo.com/ytngmagazine Watch more Superstructures: Engineering Marvels on Disney+: https://www.disneyplus.com/browse/entity-de5f9ee8-25bc-4669-8aa1-4d2c2a402156?cid=DTCI-Synergy-NatGeo-YT-Acquisition-Library-GLOBAL-NatGeo-