The second deepest ever hole drilled, The Kola Superdeep Borehole, can be found in Russia on the Kola Peninsula. The USSR was proud of it as much as it was of its space stations and underwater vehicles. Each of its 12 262 meters (40,230
ft or over 7.6 miles) below the earth's surface. was a real revelation for scientists, and a number of anomalies and strange things that used to happen during the construction work are still food for sensations.