More tunnels:

dashes show the path of the tunnel: (k3 pushes water through it)


entrance to same tunnel posted above:


short fat SPS tunnel:


another short large tunnel:


entrance to a large cave:


another cave entrance (this one is very deep and has several exits that all of the fish use frequently...you can see the lawnmower blenny in this one):


black PVC tunnel:



huge cave....especially once you get in: