mysterious hole

Holes ranging from a few meters to 60 meters wide scattered across the seabed off the coast of Germany were initially thought to be formed by methane gas, but were actually created

The mysteries of history have always been a headache for scientists as they try to find solutions to these mysterious stories.

Since the late 1980s, mysterious holes have been discovered in the dense forests of Russia. This mysterious phenomenon, then, became a scientific puzzle without a satisfactory