And yet.
The only theoretical escape is to remove the limb . And indeed, the One Bar Prison has a dark cousin in survival lore: the self-amputation scenario (127 Hours, Aron Ralston). But Ralston had a rock to use as a lever. Here, you have only flesh, bone, and a smooth metal post. One Bar Prison
Because the designer of the One Bar Prison anticipates this. The cuff is welded, not locked. The bar is a single seamless piece of hardened steel, embedded deep into concrete above and below. No tool exists within the radius. And even if the prisoner could reach the bar with a file—they have nothing to file with. And yet