"If you don't care about science enough to be interested in it on its own, you shouldn't try to write hard science fiction."
- Frederik Pohl
Robot Earthworm
Autonomous swarming robots the size of earthworms, with similar earth-digging capabilities.
It feels safe in the underground bunker, covered by many yards of dirt and gravel. Until the tiny robot earthworms come.
It resembled no machine that Pere had ever seen, rather it looked like a mass of tiny gleaming roots: the red earth still packed between them heightened the illusion.
"How does it work?"
The robot reached out - leaning very close to focus its microscopic eyepieces - and carefully pulled one of the strands free. It lay on the robot's outstretched metallic palm, eight inches long, an eighth of an inch in diameter. Seen close it was not completely flexible, but made instead of pivoted and smoothly finished segments. The robot pointed out the parts of interest.
"...At the front end is a hard-edged orifice that drills a hole in the ground. Debris is carried back through the body of the machine and eliminated here: in operation it is not unlike the common earthworm. Directional apparatus here guides it, oriented by a gravimeter to locate our base. Here a power unit and here a frequency generator...
"They have no metallic components ... they move very slowly... we estimate they entered the ground four years ago."
Elsewhere they are referred to as "plastic spaghetti."
In their operation, these robot earthworms remind me of these real-life Self-Replicating Modular Robots (really an organized swarm of segments - "pivoted and smoothly finished segments"):
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