this project is coming along nicely. the tunnel is clear through and all walls/floors are reinforced. we've popped a few of the ore veins in the way, but 4 or so remain to be removed.
however, during the construction someone has mined a few shafts out the side of the tunnel. are these required to be collapsed and reinforced before the tunnel is considered complete? the cost of doing so as i understand it is likely to be more than we can expect for tunnel payment.