Having located the colonists through transmitters that confirm they have been huddled together in a single element of the complex, the Marines resolve to guns that are roll-in and save your day. Whatever they find, however, are walls enveloped with cocoon-like resin and inside colonists who act as hosts to alien Facehuggers. At one time, the aliens attack and, caught off guard, the Marine’s numbers are cut right down to a handful. By the right time they escape, their shootout has caused a reactor leak that may detonate in many hours. Panicked, outnumbered, outgunned, and now away from time, the few survivors huddle together, section themselves off, and attempt to devise a strategy. To flee, they must manually fly down a dropship from the Sulaco. But since the coolant tower fails on the complex’s reactor, the whole site slowly would go to hell and can soon detonate in a explosion that is thermonuclear.