A nuclear silo may build and store one missile each.
A ghost launches and "aims" the nuclear missile at a targeted location. The missile arrives 14 seconds after. The ghost must aim for the entire duration; if the ghost takes any other action, or the ghost is killed, or the missile is cancelled, the launch is aborted and the missile is wasted.
The launch is broadcast to all players with the audio and visual message "Nuclear Launch Detected." The targeted location is visible to all players as a small flashing red dot.
The missile deals 500 damage or removes two-thirds of total hit points (whichever is greater) to all units within a wide blast radius. One nuke kill most units, and critically damage most buildings. Two nukes will destroy nearly anything. Without Ocular Implants, the ghost's targeting distance is within the blast radius.
Additional nuclear silos were found on the Dominion world Cruxas III. They were destroyed by the zerg in order to test out their carrion strain swarm hosts, as well as to pave the way for the Korhal invasion.
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Underwood, Peter, Bill Roper, Chris Metzen and Jeffrey Vaughn. StarCraft (Manual). Irvine, Calif.: Blizzard Entertainment, 1998.