Amazing! I felt claustrophobic just watching the video, though it was fascinating. I used to live in the Cascade neighborhood but had never heard of the Clark House, and never knew about the tunnel. I'm curious about those places but too cowardly to go into one, so I like vicarious viewing. I was surprised at how clean it was, after so many years, and what good condition it seemed to be in. Thanks for posting. Could have lived without that "music," though!