The security gates were Terran Dominion structures located on the prison ship Moros.
In 2505, when the ship was attacked by the zerg, its defenses breached, and after the attempt to destroy the prison deck coupling failed and the zerg penetrated to the prison deck, Arcturus Mengsk set the ship to self-destruct.
Sarah Kerrigan and her forces nevertheless destroyed the gates blocking their path, and rescued Commander Jim Raynor.
References[]
- Blizzard Entertainment. StarCraft II: Heart of the Swarm. (Activision Blizzard). PC. Mission: Heart of the Swarm, Conviction (in English). 2013-03-12.