Video: The greatest depth in the human world ever conquered

If people could go down to Earth's heart, it would be more difficult and more laborious than we thought. Let's see the present, how much humanity has conquered the depths underground.

Catacombs of Paris.

1. The graves are often buried 1.8 meters deep.
2. Most Olympic swimming pools are designed to be 3 meters deep.
3. The Nile crocodile can dig a nest 12 meters deep.
4. Paris tombs are 20 meters deep underground.
5. The ancient Derinkuye underground city in Turkey has a depth of 85m.

Z-44 Chayvo oil well is the deepest place that people can dig, but we have to dig another 6,400km to reach the center of the Earth.

1. Video: The endless journey to the center of the Earth
2. How long does it take to fall through the center of the Earth to the other half vertically?
3. The deeper you go into the Earth's core, the higher the temperature: Why is that?