deep hole

Whether of natural or artificial origin, many unique craters impress by depths of up to hundreds of meters and their diameter in kilometers.

The origin and sudden disappearance of a bottomless pit deep in the hills of eastern Washington state in the United States is a secret for decades.

Time travel is an interesting topic that is the subject of many science fiction films, besides it also makes a lot of gray matter for many aspiring people to create a capable

The pit hole was found by Chinese and French scientists in the Guangxi Zhuang Autonomous Region, China, up to 420 meters deep, nearly double the normal level.

Scientists use unmanned aircraft to explore a beautiful deep pit in the lake in Portugal.