"Some of the oldest cities' inhabitants have created different pathways to the older layers beneath them. The tunnel networks are so efficient that descending through the levels is now completely unnecessary."

Do you really want to step outside into hostile territory? Of course not. Tunnels are the solution. Covered traversal walkways that can connect a sprawling network of M.U.L.E cores to each other.

Please Note:

One M.U.L.E Tunnel is supplied.