Sub-surface, Perfection Valley, NevadaHibernation. Hundreds of years of quiet hibernation, waiting to run out of food, waiting to grow. Always waiting to grow. The latest long cycle was nearing its end; dormancy would quiet, and the rapid-paced life cycle would come with the Great Warmth. Digs Vigorously was old - so old that she could remember six long cycles - but she still hadn't gotten her shakes yet. This new brood would be born feral, and only the strong would survive. Digs Vigorously had seen six broods grow past her, get the shakes, and hatch upper void runners. She herself always joined them in their hunts, feasting on what vibrations she could find near the upper void, always glad that the broodlings were born dumb. They would chase the vibrations past the side void if that's where the vibrations ran. Some time later, the Great Warmth did come again, and the desperate feeding frenzy began again.
They broodlings learned quickly, though, and soon enough Digs Vigorously began to lose her edge. Her skin was numb in places; she couldn't detect everything she once could. She'd managed to feast while the brood was dumb; she was bloated, resting in a comfortable layer of clay, wondering when her shakes would begin. Then vibrations swarmed around her. The clay was jumping, hardly deadining the vibrations at all. And they just got more intense. Digs Vigorously found herself in immense pain from the vibrations. She could just feel one of the broodlings circling crazily, blindly trying to find the source of the great vibrations in order to eat it. So great were the vibrations that Digs Vigorously lost herself for a while. When she came back to the ground, something felt wrong, far above and around her. The upper void had changed somehow. As had the rest of the ground.
Digs Vigorously cautiously sent a subsonic test wave through the earth. The side void had expanded, and the four walls of stone were gone. Something mushy was beyond the side void now; something like void yet still present, somehow. That was good. More room meant more hunting grounds, which meant less competition. Vibrations
-rhythmic-scraping-fast-moving south reached her from the south, and somewhere far above.
Food! The broodlings sensed it, too, and one of them - the largest one - was already making its way toward the vibrations. Digs Vigorously didn't survive this long by being curious, so she stayed behind. A few broodlings stayed nearby, too, either being too weak, too lazy, or too stupid to chase after the vibrations.
A large
graboid launched itself after the tug. The displacement flash had paralyzed it for long enough that it was far behind the tug, but as it approached the moon base, it shifted targets to the nearest thing making noise that was touching the ground. It seemed rather unfazed by the foreign terrain (or perhaps it was just too stupid to notice), and kept tunneling straight through it. A small furrow was visible in the lunar dust as the graboid hurtled toward its target - an off-duty soldier enjoying the new-found oxygen near the edge of Eagle's Nest One.
The graboid stopped short of the man and poked its three snake-like tongues from the lunar dirt. they blindly groped around, searching for the source of the vibrations. It found them, grabbed the soldiers leg, and pulled him toward its subterranean mouth. The soldier died screaming, dragged underground, caught by complete surprise.