mysterious hole in siberia

6 mysterious phenomena, although science has been developed for a long time, still cannot be answered
With the explosion of science and technology, humans are gradually solving the long-standing mysteries.
Appeared more mysterious craters in Siberia
A new 20-meter-diameter crater was discovered in Russia's Siberia region, causing concern for local people.
Video: Mysterious crater in Siberia
A new large crater was discovered in Siberia, Russia, in the area called