The Wave Motion Gun(波動砲hadō hō) was a powerful weapon capable of destroying anything as large as Australia. Its energy comes from the Wave Motion Engine, which is a large device that behaves as a high-power capacitor. This "capacitor" charges up the power input to the critical point of 120% at which point the person in charge of the firing mechanism releases the final safety lock and fires the weapon when ready. Due to the massive need of concentrated power, the "barrel" of the weapon is required to be long, and in the Yamato's case, the barrel is the whole ship from the engine to the firing gate. Light emitted from the cannon is so intensive that crew within the light range of the cannon must wear Anti-Shock/Flash goggles in addition of tinting the window.