I'm wondering what happens beneath the earth while we keep drilling for oil. If you know that we drill millions of liters a day, what does this do to the mantel of our earth? :shrug: Are there giant caves ? you could fit city's in it. Are earthquake a result of this? What happens if by some way the mantel colapses. Would this leave a giant hole? and if so what effect would this have on the spinning of the earth? I know that are a lot of "ifs" butt it is something i think about alot. Mankind is destroying our planet but doesn't care.