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Watch Building the Impossible Season 3 Episode 2 online. Maybe available on Youtube, Netflix, PrimeVideo, Hulu, Disney and other legal streaming platforms.

From stormy seas to the land-locked Mojave Desert, Rob Bell discovers the amazing story of how the mighty Colorado river was tamed and how the Hoover Dam was built. The presenter abseils down the canyon to find out how to help maintain the turbines, and gets his hands dirty with an alien species that threatens the dam's future.