21-25 Tunnel Facts
21. Cincinnati has a “ghost” subway – a set of tunnels and stations that were built but never used. – Source
22. After the Napoleonic Wars, a tobacco merchant named Joseph Williamson paid people in Edge Hill, Liverpool to dig miles-long tunnels underground. The tunnels served no purpose, and he did so only to provide employment. – Source
23. There are plans to build a tunnel between Spain and Morocco, connecting Africa to Europe. – Source
24. In Clifton, New Jersey there is an old sewage tunnel system knows to locals as The Gates of Hell. Urban legend has it that the drains go on for hundreds of feet underground, layered seven times just like the circles of hell. – Source
25. The Holland Tunnel’s ventilation system changes out all of the air in its 2 tubes (about 3 miles’ worth) every 90 seconds. – Source
26-30 Tunnel Facts
26. During the Vietnam War, Quang Tri natives moved their village into underground tunnels 30 meters deep to escape US air strikes. The tunnels included 3 levels and were used for 6 years. – Source
27. NASA built a wind tunnel in 1965 that could reach speeds of Mach 50. – Source
28. China has a 5,000 km underground tunnel system that is used to store and transport nukes to their silos. It’s called the Underground Great Wall of China. – Source
29. NYC’s water supply comes from two tunnels that have not been shut down for maintenance since 1917 and 1935. A third tunnel, being built to shut the other two down for repairs, has been under construction since 1970 and isn’t expected to be finished until 2020. – Source
30. The vault at Fort Knox has an escape tunnel in case somebody gets locked in. – Source
31-35 Tunnel Facts
31. The longest road tunnel in the world, Lærdal Tunnel in Norway, 15.23 miles long, contains 3 “mountain caves” lit in blue and gold and designed as turn-around points and to help lift claustrophobia. – Source
32. An abandoned turnpike tunnel through a mountain in Pennsylvania has been secretly used by NASCAR for race car testing over the last 10 years – only recently have they revealed details about its operations to the prying public. – Source
33. 1,000 people live in 200 miles of flood tunnels underneath Las Vegas. – Source
34. There is a 3.4 km long tunnel under Germany built only to test lasers. – Source
35. There is a conspiracy theory that Egyptian treasures and tunnels were found in the Grand Canyon in 1909 and subsequently covered up by the Smithsonian. The area in question has numerous Egyptian landmark names and is currently off-limits to all hikers. – Source
36-40 Tunnel Facts
36. Elon Musk started a company called “The Boring Company” for digging tunnels. – Source
37. There is a mystery tunnel in Arlington, Virginia, that was once used to protect children from getting hit by cars in the 1950s but nobody has any record or knows where it came from. – Source
38. There are 15km of tunnels dug into chalk, under Chełm, Poland. These tunnels were dug right from the cellers of people’s homes, they eventually met up with other tunnels creating a vast network. – Source
39. Brunel built a tunnel, which he aligned so the sun would shine through it at dawn on his birthday every year. – Source
40. Archaeologists have discovered that Jews at the Sobibor death camp built a tunnel in an attempt to escape the gas chambers. The tunnel ran from barracks to outside the camp fence. – Source
There are only 2 pages? Where are the other 20 facts?
within the 2 pages are 40 facts! 🙂