We visited this location several weeks ago but we could not advance through the arched tunnel because we didn't have the proper foot gear; but we could see the tunnel split up ahead so we assumed it continued. Today we returned with our waterproof boots, ready to explore the whole system. We walked the the arched tunnel, and to our dissapointment the drain ended 50 feet after you walked down one of the three RCPs. Howver the drain was interesting because in the small space it occupies, it had everything you would want to see in a drain, all at one spot, which actually made in pretty cool.