The 4th interesting site is plantation tunnel #19. This one supplies water still used by the population of lower Wai`anae Valley. The entrance is collapsing slowly. Down to my right is the tunnel entrance, and about 10 feet inside is a solid steel door to keep people, animals and any other thing out that might contaminate the water.
Loosing count of sites yet? Here are two shots of rather large eucalyptus trees growing not far from tunnel 19.
