Water Jet. © 2016 Cut In Half
The answer is water jet or laser jet. Water jet is the industrial tool used for cutting various types of materials, including iron.
It works by spraying high-pressure water through a small gap, like a laser. To increase the strength of water jet cutter, usually in water is added a mixture of metal dust or granite.
2016 Water Jet Cut In Half
The strength of the water jet can be seen in the video below. Where a laptop can be cut easily, like cutting a cake knife.
Please note when the water jet has a pressure of up to 60,000 psi. As an illustration, the air pressure of a car tire filled only 35 psi. In short, the water jet is a sword that is able to split anything.