A fully enclosed natural cave chamb...

A fully enclosed natural cave chamber, completely underground with rock on all sides including the ceiling, no opening to open sky. 30x30 blocks, ceiling only 20-25 blocks high. Styled like a ruined old blacksmith forge built inside the cave: mossy cracked stone, an old anvil, rusted tools, a broken cold furnace, rubble on the floor, stalactites hanging from the low rock ceiling, dim torchlight.