Taking inspiration from nature, scientists have created a unique material that cannot be cut. Proteus will find many applications not only in the army, but also in anti-theft security. The new lightweight material was created on the initiative of scientists from the British Durham University and the German Fraunhofer Institute, led by Stefan Szyniszewski, Assistant Professor of Applied Mechanics at the Faculty of Engineering in Durham. The team was inspired by the exceptionally hard and crack-resistant shell of aragonot molluscs and the structure of the grapefruit peel. This is how an indestructible, lightweight material was created that has only 15% of the density of steel. Proteus is made of ceramic alumina balls encased in an aluminum foam structure. During testing, the material proved to be cut resistant with angle grinders, drills and high pressure water jets. Moreover, when you try to cut, the material starts to vibrate, damaging the cutting disc or drill bit. It is therefore the first material produced that cannot be cut. The revolutionary material can be used, for example, in the armed forces to increase security and ensure health protection. With the help of Proteus, it will be possible to create, among others, light armor for soldiers, protective equipment for people working with cutting tools, as well as indestructible bicycle locks.