Knee Deep in the Dead

Transferred from earth into outer space,
 A base on mars; the most desolate place,
 Home to secret projects and nuclear waste,
 Something's not right, there's this evil I taste.
 In the ninth corridor I'd pass on my way,
 A gateway stood that the scientists made,
 An "inter-dimensional space traveling" door,
 That on its test run opened up to hell's core.
 Spewing out all over the radar scan,
 An unknown life-form; one never seen by man,
 Invading the base killing all who is in sight,
 Before I knew it I was the last one alive.
 Equipped all my weapons base is on high alert,
 No one picking up distress signals I'm sending to earth,
 Locked up all sector seven-eight floors,
 I'll trap them inside the ninth corridor.
 Sector seven-eight's down, destroying all the floors,
 Extermination is what they're here for,
 I shut off the lights and use infra-red,
 Hunting the hunters I'm knee-deep in the dead.
 From the shores of hell to our human realm,
 The devil sent his minions to overwhelm,
 Every one I kill ten emerge from the gate,
 They've arrived on earth and it's all too late.