Just a nit: fracking problems aren't from the depth of the drilling. In fracking (hydraulic fracturing) they drill a hole then push high pressure fluid into the

Just a nit: fracking problems aren't from the depth of the drilling. In fracking (hydraulic fracturing) they drill a hole then push high pressure fluid into the hole in such a way as to cause large volumes of rock to break apart. For something like this, you'd want the hole to be stable and not tear apart all the rock around it, like in a traditional well.