Asphalt is pretty soft, especially when compared to concrete.
Lay a piece of 11 gauge steel on top of some black top, and hit it with an axe. See how far you get.
Many people overlook the physics involved in a safe attack, as well as the common entry methods. I've been in this business since the mid 90's, and have never seen a safe axed open.
Even a safe using gypsum board would be substantially more secure against this type of attack, if it was using an inner steel liner.
|