Mark IV Thermonuclear Device, Half-Life Wiki

The Mark IV Thermonuclear Device, nicknamed "The Package", is a thermonuclear warhead stolen by the Black Ops, and used to destroy the Black Mesa Research Facility. In the thirteenth chapter, "The Package", Shephard discovers two other Black Ops assassins setting up the bomb in an underground parking lot under the large Ordinance Storage Facility and connected to Sector E Materials Transport. After killing the assassins, he deactivates it. Afterwards, he proceeds to a nearby room with a view on

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