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Building Giants: Season 4

4x03 Underground Mega Highway
TV-PG

  • 2020-05-21T01:00:00Z on Science
  • 45m
  • United States
  • English
  • Documentary, Reality
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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