How deep can the excavator invented by human beings reach underground?

Dig the deepest part of the earth! That is to dig a hole in the earth! According to our common sense, ancient people usually only dug a hole of 1.8 meters when burying bodies, but some special people would dig up to 4 meters. Compared with the graves of some animals, human graves are very shallow. Some animals will dig about 10 meter to hide themselves well. 10 meter, all unarmed. Now human beings have invented many tools, so it is much easier to dig.

Nowadays, subways are being built in cities, and they are all dug with special tools, so the depth of the subway is relatively deep. At present, in China, the depth of the subway should be the Beijing subway. The deepest part of Beijing subway is 32.5 meters. How many floors are there? Will it take some time to walk to such a deep subway? But compared with the deepest subway in the world, the depth of Beijing subway is nothing. It is said that the deepest subway in the world has reached the underground 100 meters, but compared with the depth of plant roots, the deepest subway in the world has been compared. Because the deepest plant roots can go deep underground 122 meters.

In fact, these depths are really nothing compared with drilling. It is said that the depth of the deepest mine in the world is 970 meters, which means that it is almost a kilometer, but the underground concert halls in Finland are all underground 1400 meters. So 1 km compares it again. You think the underground depth of 1000 meters is terrible, but it is not as deep as the ultra-deep drilling in Kola, the Soviet Union. It is said that this deep borehole has reached 12262 meters. Wow, it is 10 kilometers. Will it drill into the earth's crust? Don't worry, this depth is still 1 from the crust!

The previous excavations are all aimed at building public facilities for mankind and benefiting mankind. But the last item is actually digging through the earth. Why did it stop later? After going deep into the earth 10 kilometers, the rocks inside the earth are getting harder and harder, and the temperature is rising. The human digging tools can no longer dig, so they stop digging.