Vietnam Tunnels and Underground Villages

Check out this link.

During the Vietnam War this village went 10 meters underground. Houses, hospitals, wells, and kitchens were all move below. When the US sent a bomb designed to borrow down 10 meters failed to blow up they used it as a ventilation shaft and moved the village 30 meters down. Read more and click the link!

http://en.wikipedia.org/wiki/Vinh_Moc_tunnels

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