The day people started to make the deepest hole – level 2
The deepest hole ever drilled is called the Kola Superdeep Borehole. It was drilled by the Soviet Union in the Kola Peninsula near the Russian border with Norway.
The project began on 24 May 1970. The goal of the drilling was to go as deep as possible to get information about the Earth’s structure.
The hole is 23 centimeters wide, and to drill the hole was a slow and difficult process. It took 19 years to reach the final depth of 12,262 meters in 1989. Drilling was then stopped because the temperature became too high.
Difficult words: drill (to use a machine to make a hole), peninsula (a piece of land with water from three sides), depth (how deep something is).
What information was discovered by drilling the Kola Superdeep Borehole?
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