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Science Channel – Building Giants: Season 4 (2020) Episode 3 Underground Mega Highway

Building Giants Series 4 Part 3 Underground Mega Highway

Building Giants: Series 4 Part 3 Underground Mega Highway
An expert team of engineers use hi-tech explosions and state-of-the-art drilling rigs to tear through solid granite and build an 11-mile underground tunnel, one of the longest in the world.

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