It seems unlikely to me that any bike lock, whatever it is made from, will be uncuttable and strong enough to resist all brute force attacks. But we can hope. 
World's first 'uncuttable' material created by British engineers is inspired by grapefruit and shells and could be used to make lightweight armour and 'unbreakable' bike locks Researchers say the material was named Proteus after the Greek god of the sea It can also disperse any waterjet as spheres inside it cause the jet to spread out Proteus is made of ceramic spheres enclosed in a cellular aluminium structure The team say Proteus could be used to create a new type of lightweight armour
World's first 'uncuttable' material created by British engineers is inspired by grapefruit and shells and could be used to make lightweight armour and 'unbreakable' bike locks Researchers say the material was named Proteus after the Greek god of the sea It can also disperse any waterjet as spheres inside it cause the jet to spread out Proteus is made of ceramic spheres enclosed in a cellular aluminium structure The team say Proteus could be used to create a new type of lightweight armour