The group will drill conventional resources at ultra-deep wells that extend as much as 10,000 meters (6.21 miles) below the surface in places like northwest Xinjiang’s Tarim basin region where CNPC and Sinopec are major players. It will also seek to tap deep shale oil and coal-seam gas resources.
The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol’skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth, which attained maximum true vertical depth of 12,262 metres (40,230 ft; 7.619 mi) in 1989.[1] It is the result of a scientific drilling effort to penetrate as deep as possible into the Earth’s crust conducted by the Soviet Union in the Pechengsky District of the Kola Peninsula, near the Russian border with Norway.
10 km seems insane to me.
Have to Google something
https://en.m.wikipedia.org/wiki/Kola_Superdeep_Borehole