A typical floor constructed of 6 to 8 inches of poured concrete and reinforced with rebar steel rods or 6-inch square mesh no.

A typical floor constructed of 6 to 8 inches of poured concrete and reinforced with rebar steel rods or 6-inch square mesh no. 10 wire can be penetrated with by three adversaries using sledgehammers, explosives, and bolt cutters in 5 minutes.