Podcast: Download (Duration: 3:00 — 2.1MB)
A trip here will reveal some of the longest and deepest holes dug into the earth. In fact, some of the tunnels are so long, it took the world’s largest winch to move men and supplies up and down the line…
Some of the Longest and Deepest Holes Dug In the Earth
August 20, 2018 by
