2. A Thirty-Foot Hole
Place: Russia
Discovered in 1900
Estimated value: N/A
What is located at Earth’s center? In an attempt to discover the solution, Russian scientists dug a 40,000-foot-deep hole into a distant peninsula over several decades. However, during the excavation, an odd incident occurred that compelled the researchers to swiftly and silently plug the hole.
An Immersion of 40,000 Feet into
As the scientists continued to dig, the temperature rapidly increased to 356 degrees Fahrenheit. The Russian crew realized they had to give up on the project to prevent their equipment from being destroyed because the granite was extremely soft. In 1995, the Kola Superdeep Borehole was declared officially closed.