hey...drilling by cut, a banking reinforced vault, means cutting 105mm of reinforced steel !!!! to drilled it by melting you need a 2500.º degrees torch...2 problems, the IR heat detector of the room, and the heating sensor inside the vault....right...second part, you want a blade...you got it...they use blades enough for this...on recycling bridges ...do you consider that an option??? I mean at 4 am...even Moscow would hear it