How are huge tunnels made in rocks and under water? What kind of incredible machines are they used and what size are they? I will tell you about an incredible level of technology,
capable of destroying everything in its path, leaving behind smooth walls! And at the end
I'll show you the secret American tunnels,
which are hidden all over Europe! For what?
Better watch it!
Recycling: How Do They Do It?: https://youtu.be/2MghUGW_1XA
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Timecodes:
00:00 Introduction
00:20 Tunnel boring machines
01:55 Big Bertha
03:24 What happened to Bertha?
04:23 The Lady Bird
06:17 Hiking through the Alps
08:27 Brenner Base Tunnel TBMs
10:26 Fangsheng
12:20 Moscow metro
14:05 US underground bases
15:38 Conclusion
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