From The Wiire:
"Dead Space: Extraction is an on-rails first person shooter. Extraction serves as a prequel to the popular game Dead Space, which released for the Xbox 360, PS3, and PC in 2008. The story follows various characters on the surface colony of a planet called Aegis VII. The goal of the colony was to scan the planet for resources, so that a large ship called a Planet-Cracker (the USG Ishimura from Dead Space), could remove said resources from that planet, and return them to a now resource-depleted Earth."