7 most impressive deep holes in the world

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

Mir mine, Russia

Mir diamond mine in Yakutiya is 525 m deep and 1.2 km in diameter.The Mir mine was opened in 1955 to meet the demand from the Soviet diamond industry.This open pit produces two million carats of diamond each year and closed in 2001. (Photo: Sputnik / Aleksandr Utkin.)

Kimberly Mine, South Africa

The 500-meter Kimberley mine in South Africa, also known as the "Big Hole", was the result of the gold fever on the De Beers brothers' farm in 1871. Mining in this area ended in 1914 and It became a tourist attraction since the 1960s. (Photo: Wikipedia / Irene 2005.)

Hell Gate, Turkmenistan

The Hell Gate was born in 1971, when Soviet oil exploration engineers conducted drilling in the area near Derweze, Turkmenistan, because they believed there was oil on the ground.The drill causes the ground to collapse, forming a large crater, where natural gas spills up.Geologists fear that gas will cause harm to local people, so it has burned holes to prevent gas spreading, but did not expect the crater to burn until today.(Photo: Wikipedia / Tormod Sandtorv).

Sedan pit mouth, USA

Sedan pit mouth formed by an underground nuclear test that took place on July 6, 1962 in the Nevada Bomb Test Zone.The nuclear test fired 12 million tons of soil into the air and created a crater more than 100 meters deep, 390 meters wide.(Photo: Wikipedia / US Federal Government).

Moray site, Peru

Moray is an archaeological relic in southeastern Peru, 50 km northeast of Cuzco, built by the Inca civilization.The work consists of many circular holes connected by stairs.Largest hole is about 150 m deep.Incas can use them to research agriculture.(Photo: Wikipedia / Philipp Weigell).

Big green hole, Belize

The big green hole is an underwater sinkhole off Beliza.The hole is 300 m wide and 125 m deep, is the largest underwater sinkhole in the world.It formed during glacial events more than 150,000 years ago.(Photo: Flickr.)

Vredefort, South Africa

The Vredefort crater appears when a meteorite hits the Earth about two billion years ago.This is the largest crater created by the collision recorded on Earth.According to the researchers, it has a diameter of 300 km when newly formed.(Photo: Wikipedia / Julio Reis).