Have you ever wondered what would happen if a hand ended up under water moving as fast as a bullet? This is abrasive water jet cutting where water is pressurized and forced through a tiny hole, it turns into the world's sharpest blade. Many industries use this technique to effortlessly cut through the metals. It can cut through almost anything, even multiple layers of bulletproof glass and diamonds. These guys made an artificial hand with bones as strong as the real ones, and when they slipped it under this machine, at first it sliced through the outer layer almost instantly. But when they left it under the cutter for longer, it even penetrated through the bones.