When the Russians drilled 12 kilometres into the ground, they didn’t reach China

Beginning in 1962, the drilling effort was led by the USSR’s Interdepartmental Scientific Council for the Study of the Earth’s Interior and Superdeep Drilling, which spent years preparing for the historic project. It was started in parallel to the Space Race, a period of intense competition between the U.S. and U.S.S.R. The survey to find a suitable drill site was completed in 1965 when project leaders decided to drill on the Kola Peninsula in the north-west portion of the Soviet Union. After five more years of construction and preparations, the drill began to nudge its way into the ground in 1970.

Damn Interesting Wikipedia.