It has been done....well....almost....
The Kola Superdeep Bore Hole....a mere 40,230ft deep hole in Russia started in 1970.
There were claims that the locals could hear screams as if from Hell itself
During the Cold War, the US and Soviets both created ambitious projects to drill deeper than ever before.
www.bbc.com
The hole also featured on an episode of Abandoned Engineering. The complex around the bore hole has long since become derelict but there is still a cover tightly bolted onto the top of the bore hole and part of the drill bit was left down there