In 1972, The Los Alamos National Laboratories patented a nuclear tunnel boring machine, claiming it could reach depths of 18+ miles. It uses molten lithium to melt through rock, leaving behind a tunnel with a glass-like finish. – WTF Fun Facts
Source: METHOD AND APPARATUS FOR TUNNELING BY MELTING – ATOMIC ENERGY COMMISSION USA (freepatentsonline.com)
If you fell into a tunnel through the center of the Earth, it would take you 42 minutes to complete the trip to the other side of the planet. You would reach a maximum speed of over17,500 MPH at the center of the Earth. – WTF Fun Facts
Source: https://www.scientificamerican.com/article/would-you-fall-all-the-wa/
In the 1930’s, cow tunnels were built by Pennsylvania Railroad under New York city to more easily transport cows to slaughterhouses. – WTF Fun Facts
Japan has installed special concrete tunnels under some of their train tracks to allow for turtles to cross the tracks. – WTF Fun Facts
Source: https://www.independent.co.uk/news/world/asia/japanese-rail-workers-build-special-tunnels-to-save-turtles-from-train-deaths-a6757466.html
