The system consists of a sort of real steel cage that wraps around the safe. The ATM operation is guaranteed by a door protected by tearproof rostrums, on the hinge side, and a lock with three large section bolts. The structure of the cage is modular, to facilitate installation both on already operational Cash Machine and in case of new installation, and adjustable in height to adapt to the positioning of the ATM. The cage is then fixed to the ground and, optionally, also to the ceiling to offer maximum protection from attempts to uproot and remove the "ATM".