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the stone wall of the outer 5 squares is native and smoothed, hollowed out and the pumps built in. There is a restriction of building pumps to tiles flagged outside and light, but no restriction when underground and dark. Had to watch out not to make any unnecessary holes, since if light shines through, can't build there
Possible, would need to build a magma-proof pump tower, done that in previous revisions.
Though now i can loot all the valuables from all goblins that fall to the bottom
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::shrug:: I guess I didn't need this space after all!