The Russian scientists had done an experiment to know about the earth.they started working on a huge hole in the earth.this experiment was started for 24 years.In 24 years a 12-kilometer long hole was formed but the scientists did not know its adverse effects.Some people said that this can lead to natural calamities and the creatures within the earth will come out and which can be a threat to our earth.In 1994 the experiment had to be closed because reach 12 kilometers the temperature had reached up to 180 degrees so it was difficult to dig it forward.
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