“The distance from the surface to the center of the Earth is 6370 km, which is not so much. It is estimated that if you dig a well to the center and throw a brick at it, it will reach the bottom in just 45 minutes. Our attempts to advance towards the center were truly modest In South Africa, one or two gold mines reach a depth of more than 3 km, and the depth of most mines and mines on Earth does not exceed 400 m. If the planet were an apple, we would not even pierce the peel. In fact, we would not even come close to that.”
“By the 1960s, scientists were pretty disappointed with their ignorance regarding the arrangement of the earth’s bowels to try to do something. In particular, there was an idea to drill a hole from the bottom of the ocean (the crust on the continents is too thick) to the surface of Moho and get a piece of the Earth’s mantle in order to study it slowly and at leisure, we thought that if you understand the properties of rocks in the bowels of the earth, you can come closer to understanding their interaction and thereby, perhaps, learn to predict earthquakes and other undesirable phenomena.
The project was almost immediately dubbed Mohole, and it crashed almost completely. The plan was to lower the drill to a depth of 4 thousand meters in the Pacific Ocean off the coast of Mexico and drill 5 thousand meters of rock in a relatively thin crust of the earth. Drilling from a ship in the open sea, according to one oceanographer, “is like trying to drill a hole in the sidewalk of New York from the height of the Empire State Building with spaghetti.” Each attempt ended in failure. The largest depth that the drill went through was only 180 meters. So Mohole came to be called No Hole. In 1966, due to ever-increasing costs and lack of results, Congress snapped patience and closed the project.
Four years later, Soviet scientists decided to try their luck on land. They chose a place on the Kola Peninsula near the Finnish border and set to work, hoping to drill a well to a depth of 15 km. The work was harder than expected, but Soviet scientists were distinguished by commendable tenacity. When finally after 12 years they left this occupation, 12,262 meters were drilled. Taking into account that the Earth’s crust is only about 0.3% of the planet’s volume and that the Kola well has not passed even a third of the crust’s thickness, we can hardly claim subjugation. “
Therefore, unfortunately, people have to explore the composition of the Earth in other ways.