Before I find a real life person to ask
, I had a question of how much work it would take...
I have a rancher where half the house is full basement, and the other half slab on grade. I want to tunnel under the slab and connect it to the full basement which has cinder block. I would like to do a roughly 6' wide by 30' tunnel to possibly use but not really use for things like suppressed shooting. Or perhaps a bowling alley would be nice. Or an archery range. The use is not relevant.
The slab is 10" thick with rebar. I have drilled down and cut in to multiple spots for plumbing issues. The slab is on grade, but it is also resting on top of the cinder wall towards the basement side. A plumbing issue from the previous owner essentially left a 2' gap under the slab closest to the concrete wall (the main drain runs along the cinder wall, UNDER the slab and the pipe broke at some point). Something needs to be done eventually anyway to fill that void (probably just pump the mud in there at some point), thus my brilliant idea of an archery range/something like that.
Feasible? Not feasible do to cost restrictions? Not feasible at all?