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The breakthrough engineering behind some of the fastest things in the universe: Orion Space Craft & Shanghai Maglev.
MS Harmony of the Seas, an Oasis-class cruise ship, is the world's biggest. (S02E06, "World's Biggest Cruise Ship") Virginia Class submarines, like the USS Colorado, are the most advanced nuclear-powered, fast attack submarines ever produced for the U.S. Navy. (S02E07, "U.S. Navy's Super Submarine")
How two of the toughest things on Earth are engineered: the Three Gorges Dam and the AT&T Stadium (Dallas Cowboys).