Our walls are made of poured concrete.
If I wanted to install a wall-safe, what would be the most efficient way to do that?
When I added a vent to the bathroom I simply drilled a lot of holes next to each other in a circular shape with a long drill-bit. That and a hammer and I was done.
But for the size of a wall-safe, that will take me many man-years to do.
What tools or techniques do I need?
I do not want outsiders to install the safe; security by obscurity is a safety feature I hope to gain.