Many times we have heard about the tallest place on earth and as all know the answer is the great Mount Everest. But we are wondering where is the deepest hole on earth? While the searching answer of this question we at Eruditeblog have got some interesting information and we would love to share with readers.
In actuality, the Kola Superdeep Borehole consists of several holes branching from one central hole. The deepest of these, named “SG-3”, measures just nine inches in diameter but extends 12,261 meters (or 7.5 miles) into the Earth. That’s roughly a third of the way through the Baltic continental crust.
Soviet scientists in the 1970s decided to probe deeper than humanity has ever done before. For the next 24 years, they drilled on and off into the Earth’s crust.
Wikipedia on Deepest Hole on Earth
The Kola borehole penetrated about a third of the way through the Baltic continental crust, estimated to be around 35 kilometres (22 mi) deep, reaching Archaean rocks at the bottom. The project has been a site of extensive geophysical studies. The stated areas of study were the deep structure of the Baltic Shield; seismic discontinuities and the thermal regime in the Earth’s crust; the physical and chemical composition of the deep crust and the transition from upper to lower crust; lithospheric geophysics; and to create and develop technologies for deep geophysical study.
To scientists, one of the more fascinating findings to emerge from this well is that no transition from granite to basalt was found at the depth of about 7 km (4.3 mi), where the velocity of seismic waves has a discontinuity. Instead, the change in the seismic wave velocity is caused by a metamorphic transition in the granite rock. In addition, the rock at that depth had been thoroughly fractured and was saturated with water, which was surprising. This water, unlike surface water, must have come from deep-crust minerals and had been unable to reach the surface because of a layer of impermeable rock.