The tiny cog seemed to be insignificant, but that was kind of the point. So it was that no one noticed it unfold into a spider-like robot and start climbing up the inside of the mechanism. With the tiny clink-clank of its spindly legs, it made it to the top and started unscrewing various pieces. Despite it being small and unable to lift much, it made quick work of the upper mechanisms. In about seven minutes, its work was done.
With its task complete, the larger conveyer belt began to lean, the supports now bending with every object that passed over the sabotage. Eventually, the belt gave way and a large hunk of metal plummeted below and slammed into the reactor. Sirens wailed indicating a valve shutoff. A meltdown was imminent. The droid’s deed was done.