How Underwater Tunnels Work

Dec 12, 2013 · 31m 57s
How Underwater Tunnels Work
Description

It's a pretty amazing feat to dig a tunnel beneath a body of water that's big enough (and safe enough) to drive a train through. While humans have been digging...

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It's a pretty amazing feat to dig a tunnel beneath a body of water that's big enough (and safe enough) to drive a train through. While humans have been digging underwater tunnels for thousands of years, it wasn't until the late 19th century that it became
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Author HowStuffWorks.com
Organization HowStuffWorks.com
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