When I was in the Navy running network and power cables through an old underground WW2 era building, we were drilling through Asbestos and only set out a few cones wearing N95 masks and some goggles, your helper had a HEPA vacuum trying to suck up all the dust.
When I was in the Navy running network and power cables through an old underground WW2 era building, we were drilling through Asbestos and only set out a few cones wearing N95 masks and some goggles, your helper had a HEPA vacuum trying to suck up all the dust.