[arethuza]

Our house sits on a small basalt volcanic plug and the solid dark rock lurks not very far under our garden - 100m north of us and its sandstone, 100m south and it is limestone.

Digging a hole of any depth would probably require explosives!

[cucumber3732842]

I'd save a fortune on concrete and rebar if I had high quality bedrock so close.

[vlachen]

Hard pass. Karst limestone is bad enough.