Mark IV Thermonuclear Device

{{Technology Infobox
| image=FileNuke case.jpg|250px
| name=Mark IV Thermonuclear Device
| affiliation=*Black Mesa
*Black Ops
| type=WikipediaNuclear weapon design thermonuclear weapons|Thermonuclear warhead
| maker=
| usedby=*Black Ops (activate it)
*Adrian Shephard (deactivates it)
*The G-Man (reactivates it)
| entity=N/A
| designer=
| hidei=
| hideu=
| hideg=
{{Quote|The biggest embarrassment has been Black Mesa facility, but I think that's finally taken care of itself... Quite so.|The G-Man|Half-Life Opposing Force|The G-Man/Quotes speech 2}}

The '''Mark IV Thermonuclear Device''', nicknamed '''"The Package"''', is a thermonuclear used by the Black Ops to destroy the Black Mesa Research Facility.

FileG-Man bomb activate.jpg|The G-Man reactivating the bomb.|left|thumb|200px

The bomb is first mentioned by two Black Ops assassins in a storage area. Later in the game, 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 Sector E Storage Facility|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 the truck, and witnesses the G-Man reactivating it. He cannot return to the truck, making the destruction of Black Mesa inevitable.

The bomb detonates when Shephard is detained by the G-Man aboard an Osprey at the end of the game. He witnesses a white flash from the horizon that blinds him while the G-Man makes a slight pause in his monologue, marking the destruction of the Black Mesa Research Facility.http// ''Marc Laidlaw Vault'' on the Forums

The following instructions are written inside the bomb's cap

''MANUAL INSTRUCTIONS FOR A'' ''MARK IV THERMONUCLEAR DEVICE'' ''This device carries a GRADE C plutonium control detonator.''
''With this device an approximate safe distance of''
''55 kilometers is recommended.''
''STEP1'' ''Indispose the gravatronic rev limiter to 11.'' ''STEP2'' ''Rotate red knob to the on position.'' ''STEP3'' ''Press button labeled B.'' ==Gallery== FileBomb far.jpg|Black Ops assassins preparing the bomb. FileBlack Ops truck.jpg FileNuke explodes.jpg|The G-Man pauses in his monologue when Black Mesa is destroyed in a flash of white light. ==List of appearances== *''Half-Life Opposing Force'' {{1st}} ==References== {{Reflist}} {{Weapons}} {{Black Mesa}} CategoryHalf-Life Opposing Force CategoryWeapons CategoryBlack Mesa weapons