Ozone Bomb is a superweapon created by the Empire of the Combine Race around 540 Million B.N.E, the bomb is design to strip a planet's ozone layers, which will then either expose the planet to either high levels of radiation and or burns it and freeze it, both of these will kill off all lifeforms on the planet. Many have theorized that the Combine Develop the bomb as a means to make mining operations easier to conducted.

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