kola superdeep borehole

Do you know how deep the deepest artificial hole on the ground? The deepest Mariana Trench in the world has a maximum depth of 10,971 km.

In western Russia, there is a rusty metal piece lying on the ground. Few people know that this is the lid of the world's deepest artificial pit.

The core is the nucleus of the Earth. From the bottom of the Mantle lower layer extends into the center, about 3,473km. According to analysis of monitoring data, people divided