There is no one left to hear you scream.
Four days ago, a prospector returned to the colony of Hadley's Hope afflicted with a strange illness. He reported stomach cramps and chest pains. Two days ago, a Weyland Yutani company agent landed and started locking down segments of the colony. Twenty four hours ago, you headed out on a routine survey run, hearing rumors that the prospector had been infected with some sort of parasite, and that it is spreading.
Hadley's Hope has fallen silent. Your tractor broke down ten clicks out from the colony. Your food and water are running out. No one is coming to help...