You're in a town known as 'Perfection', the name used to do it justice until the incidents with large creatures known as 'Graboids', animals that outdate mankind, and travel underground. The situation is under control. There are cement walls underground, keeping the graboids out of the town, and you were sent there to make sure they're still sturdy.

You're about halfway done when you hear something groan very loudly, it's one of the graboids, when you get to it, you see it's one of ther bigger ones, the locals have nicknamed this one, "Terra".