The Ouroborus-class Worm was a robotic military technology in use during the later 22nd and early 23rd centuries. Deployed as territorial denial weapons, they acted like living mines which would patrol an area of ground -- burrowing underground -- and then attack intruders. Thirty meters long, their white, segmented bodies utilized wheeling coils to move, and could fuse back together if damaged or sliced apart.
Post Coalition-Conjoiner War they were present in hundreds of area throughout the Sol system, their design making it very hard to deactivate them, even for their makers. A worm of this class killed Sandra Voi on Mars, in 2205.