Entity - Donald Morrison - Bog

In 2052 a squad of Marines from the Earth Military Federation are sent to investigate a newly built terraforming colony on mars. The station has mysteriously gone dark, after unearthing an alien structure buried just beneath the surface. The unit embarks on a mission to find out what has happened, only to uncover a nightmarish blood bath-the entire colony has been violently slaughtered. Now the unit must uncover what has caused the gruesome deaths of the colonists, and manage to escape before whatever it is that is hiding in the station begins to hunt them down, and they wind up another victim of the ENTITY.