The prevalence of tunnels in nature and human life, for the purpose of overcoming obstacles or building shelters. Humans use tunnels to travel through difficult terrain such as mountains or under natural obstacles. Sometimes, people can discover unexpected things during digging. Typical examples include the exploration of an ice age cave in Montreal, Canada, where a 15,000-year-old cave was found when a limestone wall was opened.
The passage also mentions forgotten or secret tunnels, such as the tunnel under the Saxon Palace in Warsaw, Poland. This tunnel, built in the 1930s and not on maps, was once a Polish military headquarters, serving as a secret communications facility.
Some people also explore urban tunnels in the hope of finding mysteries, such as the tunnel system in San Francisco, which was photographed by photographer Sierra Hartman. Occasionally, stories of supernatural phenomena are also attributed to these tunnels, such as rumors of ghosts in the World War II tunnels in Japan, or strange creatures in the sewer system, although these are usually fabricated for horror effect.
A series of creepy and mysterious discoveries in tunnels and caves around the world, starting from historical relics to strange discoveries:
1. **Ancient defense network**: An ancient city built a defense system to protect its residents from attacks. This shows the ancient people’s efforts to create a safe place for residents.
2. **Discovery of a headless human torso**: In Idaho, about 40 years ago, a headless human torso was found in a cave. After many years of investigation, the identity of this person was only confirmed by DNA testing, which showed that it was an escaped prisoner who had killed his wife. His death remains an unsolved mystery.
3. **Tunnel in the Giza Pyramid**: The Great Pyramid in Egypt remains a mystery to scientists. In 2016, a mysterious tunnel was discovered inside the pyramid, but its purpose remains unknown.
4. **Ancient artifacts in a Mexican city**: In 2014, during excavations at a site, archaeologists discovered an ancient tunnel with about 50,000 artifacts. This is a huge number compared to the small number usually found in excavations.
5. **Paris Catacombs**: Built due to the lack of burial space in Paris, the catacombs contain more than 6 million remains. Although not all sections of the tunnel are open to the public, the place still attracts many tourists looking for thrills and mysteries.
6. **Giant Ant Colony**: In Brazil, a giant ant colony was discovered that can contain millions of ants. This shows the ants’ ability to build and organize.
7. **Williamson Tunnels in Liverpool**: Joseph Williamson, a wealthy investor, directed the construction of a network of tunnels whose purpose is unknown. These tunnels are still being explored and have become part of local culture, even appearing in an episode of *Doctor Who*.
8. **Drug Smuggling Tunnels**: The tunnels are used by drug cartels to smuggle illegal goods from Mexico into the United States, part of an elaborate strategy to circumvent the law.
9. **Crystal Cave of Giants**: This cave in Mexico contains giant selenite crystals, but the environment inside is extremely harsh, making research difficult.
10. **Cave Dwellers**: Some people live in tunnels in China, mainly for cultural and historical reasons. They have difficulty finding food and water, and live in harsh conditions.
11. **Discovery at Goff’s Cave**: Human bones have been found here, suggesting cannibalism in the past. Ancient people used skulls as drinking cups, a shockingly humane practice.
The paragraph ends with a question about other creepy discoveries that readers may know of, encouraging viewers to share more information in the comments section.
