What is the deepest point on the planet?
Many of you may be thinking of the Marianas Trench, the sea trench that’s deeper than Mt. Everest is tall.
Though you’d be wrong.
The deepest point on earth is a man made borehole, found in the Pechengsky District, Russia, on the Kola Peninsula.
Thus it is rather aptly called the “Kola Superdeep Borehole”.
At an astounding 12,262 metres (40,230 ft), and 23 cm (9 inches) diameter, deep it is the deepest point on earth, in terms of true vertical depth, as there are lower points on the earth but they are found on its surface and are a result of its topography, they aren’t holes, just lulls in the ground, for instance the bottom of Litke Deep, a trench in the Arctic Ocean, is the closest point to the centre of the earth, despite it being only 5,449 metres (17,881 feet), it is the closest due to the Arctic Ocean being the lowest of all the oceans.
Anyway, back to the Kola Superdeep Borehole.
So why was it made?
In all honesty the reason in essence was “why not?”.
Seriously the entire reason was to drill as deep as possible into the Earth's crust.
Speaking of which, how was this hole drilled you may ask?
Drilling was done by the Soviet Union, starting on 24 May 1970 and ending in 1992.
It was drilled using progressively larger and longer oil drilling rigs, staring with the Uralmash-4E and later the Uralmash-15000 series drilling rig.
The reasoning for stopping the project was due to higher-than-expected temperatures at the depth and location, 180 °C (356 °F) instead of the expected 100 °C (212 °F).
If they were to continue on to the 15,000 m (49,000 ft) target then they would have to expect temperatures around 300 °C (570 °F), at which the drill bit would no longer work.
So the entire venture was abandoned, a steel cap was placed atop the hole to stop anyone or anything from falling in, with that the centre of the earth remains a mystery (except that it’s really, really, really hot...)
So there you are definitive proof that once and for all the deepest hole in the world isn’t yo’ mama.
Further Info: https://en.m.wikipedia.org/wiki/Kola_Superdeep_Borehole