Some subterranean questions

Lets just assume that there is a movement for a large group of people to relocate themselves deep underground. Assuming they had some renewable energy source, such as geothermal energy, would life be able to thrive deep underground? What the farthest we ever dug into the earth’s crust? The purpose is to ease overcrowding by creating subterranean cities.

<sings>We Must Away,
Ere Break Of Day,
To Find Our Lost, Forgotten Gold</sings>

Hi Thorin Oakenshield! How’s Bilbo? :smiley:

Sounds like the Nazis to me!