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Full title:
Underground Mega Highway - S4.E3 - Building Giants
Episode number:
S4.E3
First aired:
May 20, 2020
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Underground Mega Highway - S4.E3

May 20, 2020
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Overview

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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