SAFE 31 3D model

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The first safes emerged in England during the 19th century due to an increase in capitalists, with simple chests and cupboards being replaced by steel cabinets equipped with strong locks. Prior to the invention of acetylene-oxygen burners, these safes were highly reliable. To enhance security, two layers of metal were added along with copper paving and a concrete layer. Initially, safes were locked with keys but burglars cracked locks using crowbars or exploding gunpowder into keyholes. Mechanical locks coded with dials were later introduced to overcome this issue. However, medical stethoscopes were used to feel the vibration of the door when the correct combination was dialed. After WWII, additional clicks were added to prevent incorrect combinations. In the 1960s, robbers started using diamond-tipped drills that overcame concrete walls. To counter this, corundum (solid alumina) was added to the concrete mixture. Modern burglars use welding lamps to create temperatures above 3000 degrees but adding graphite to the mixture causes heavy smoking and makes it impossible to stay close to the safe. Recently, robbers have resorted to stealing safes without opening them on the spot, using hydraulic equipment to remove even heavy safes for convenient opening. A refrigerator was also used in a case where a safe was placed inside for three days before being smashed with a sledgehammer.