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The one-thousand five hundred feet hole that I thew a rock in, what was if for, and how was it made?
This hole is located in Austria
as a part of a hydroelectric powerplant
Two lakes are connected to each other.
When the power plant is in use, the top lake will be emptied to the lower lake during the day
when the price of electricity is high
During the night when the electricity is cheap
the water would be
pumped back into top the top lake
To make this hole the top lake is first emptied. The second state is to excavate a tunnel underneath the lake.
Now a pilot drill is drilled using a rase boring rig. It is drille down to the tunnel underneath.
A large drill head is mounted to the drill rods and a larger hole is reamed up to the surface.