Luminescent moss grew within the mine, strategically placed to ensure all passageways were brightly lit, not to mention purifying the air regularly to ensure the Free Humans mining within were healthy.
Usually, after the Cold Shower ends and the ice thaws away, the Cooter Clansmen would arrive at the mine's entrance to hand out rations. The Free Humans would get rations according to how much minerals they had mined.
Those with better performances were rewarded with better food that would grow the weapon at the tail end of their Ewworm. The reward wasn't a better living condition. It was merely something that allowed them to mine better.
The Cooter Clan deemed this to be sufficient for the Free Humans, as they should be grateful to be alive in such a dangerous world.
Thud! Clank!