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I'm throwing a rock down a 450 meter deep hole (1500 ft).
Here is our actual KZfaq channel, we fly an aeroplane.
/ swedishvfr @SwedishVFR
Animated description of how and why this hole was made:
• I explain Why and How ...
This is a video of the drill (sorry for the bad quality):
• The drill that made th...
The hole is in Austria at the bottom of lake Feldsee, and it is a part of a hydroelectric power plant.
During the day, when the price of electricity is higher, a lake will be emptied, producing 70 MW of electricity.
During the nighttime when the electricity is cheaper, the generator will be used as a pump, refilling the lake. The pump will have a capacity of 11,3 cubic meters per second.
The total drop height will be 524 meters, where this hole is 450 meters deep.