How hot is the bottom of the Kola Superdeep Borehole?
While the temperature gradient conformed to predictions down to a depth of about 10,000 feet, temperatures after this point increased at a higher rate until they reached 180 °C (or 356 °F) at the bottom of the hole.
At 7.5 miles below the surface, the 2.7 billion year old rocks there at temperatures of around 180 degrees Celsius (or a scorching 356 degrees Fahrenheit). This was almost twice as hot as they'd predicted. Such high temperatures deform the drill bits and pipes. The rocks themselves also become more malleable.
Most of the heat is due to the decay of naturally radioactive elements,mostly within the mantle. Heat flows constantly from its sources within Earth to the surface.
The Kola hole was abandoned in 1992 when drillers encountered higher-than-expected temperatures—356 degrees Fahrenheit, not the 212 degrees that had been mapped. The heat wreaks havoc on equipment.
Microscopic plankton fossils were found six kilometres (3.7 mi) below the surface. Another unexpected discovery was a large quantity of hydrogen gas. The drilling mud that flowed out of the hole was described as "boiling" with hydrogen.
' In contrast, the Earth gets hotter and hotter at depth primarily because the energy of radioactive decay is leaking outwards from the core of the planet. While this geothermal energy is transferred to ocean water along the seafloor, the effect is so small that it's immeasurable by direct means.
Like the search for life in outer space, determining the limits of life on Earth is fraught with technological challenges. Temperatures of 120 degrees Celsius (248 degrees Fahrenheit) are normally encountered at about 4,000 meters below the seafloor.
Save this answer. Show activity on this post. It would be hot underground. Geothermal gradient indicates that on Earth, 1 mile underground would be about 40-45 C (75-80F, just as you said) hotter than on the surface.
It's Hot and It's Cold
You might expect the waters of the Mariana Trench to be frigid since no sunlight can reach it. And you'd be right. The water there tends to range between 34 to 39 degrees Fahrenheit.
The interior of Earth is very hot (the temperature of the core reaches more than 5,000 degrees Celsius) for two main reasons: The heat from when the planet formed, The heat from the decay of radioactive elements.
Can you drink boiled borehole water?
Can I Drink The Water? In short, yes, borehole water is usually safe to drink. However, The Private Water Supplies Regulations has said that you must have your private water supply checked to ensure it is consistent with drinking water standards.
Scientists found microscopic fossils of single-celled organisms at 4.3 miles (7 kilometers) down. And at nearly the same depth, they discovered water. They also found that the temperature at the bottom of the hole reached a blistering 356°F (180°C).
The baseline temperature of outer space, as set by the background radiation from the Big Bang, is 2.7 kelvins (−270 °C; −455 °F).
A scenario often presented to introductory physics classes is that of a "gravity tunnel" — a tube drilled from one side of the Earth to the other through the planet's center. The answer taught for nearly a half-century for how long a fall through such a hole would take was about 42 minutes and 12 seconds.