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Building Giants: Season 2

2x06 Mega Mountain Tunnel
TV-PG

  • 2019-09-12T01:00:00Z on Science
  • 45m
  • United States
  • English
  • Documentary, Reality
As engineers race to build a brand-new train tunnel beneath the Alps, they use cutting-edge tech and the latest construction methods to build the world's longest underground railroad in some of the most dangerous conditions on earth.
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