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  1. Series
  2. Impossible Engineering
  3. S02E05 (World's Longest Tunnel)
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  • United States of America
  • April 14, 2015

Impossible Engineering

World's Longest Tunnel

Season 2 Episode 5

How did engineers move mountains to build the longest and deepest rail tunnel on the planet? Discover how 25 million tons of rock were moved to build this modern wonder, the Gotthard Base Tunnel.

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