Wandering can be dangerous!
Especially in forests in the Ryazan region, Kaluga region and the Krasnoyarsk region of Russia where weird deep round holes have been discovered while exploring dense forests.
This strange phenomenon was observed in places where no cars and trucks can drive so where no drilling devices can be brought.
Some adventurers went into these holes. They only found absolute darkness. Weird phenomenon!
How were they built and for what actually? The source and the reason of these holes remain a mystery.