The day people started to make the deepest hole – level 3


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, with the goal of drilling as deep as possible into the Earth’s crust in order to study the Earth’s structure and geology.

The hole is 23 centimeters wide, and drilling it was a slow and difficult process. It took 19 years to reach the final depth of 12,262 meters in 1989. Then, drilling was halted due to very high temperatures and other technical difficulties.

Difficult words: drill (to use a machine to make a hole), peninsula (a piece of land which is almost completely surrounded by water), crust (the hard top layer of the Earth), halt (to stop).

What could have been the reason for the Soviets' interest in drilling such a deep hole?


Days in Levels is designed to teach you 3000 words in English. Please follow the instructions

How to improve your English with Days in Levels: 


  1. Do the test at Test Languages.
  2. Go to your level. Go to Level 1 if you know 1-1000 words. Go to Level 2 if you know 1000-2000 words. Go to Level 3 if you know 2000-3000 words.


  1. Read two new articles article at Days in Levels every day.
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