I was exploring the Harper tunnel a couple a weeks ago.
It's a beautiful tunnel. I really like how tight and twisty it is. You can tell the tunnel is seldom visited by the amount of silt laying on the line. There are a couple of clay banks along the way (I think they are clay banks anyway).
I think I was past the original end of line drawn on the map. I could see what looked like the original end of line, with different line going back even further. Later I came to a no-mount restriction and turned the dive there. I remember having to back up approximately 50' before I had room to turn around. By then I had the place completely silted out. I remember thinking on the way back, that it would be nice to be able to see again. Once again good cave training pays off.
Excellent dive if you like tight, twisty, and silty.

