Aerial view shows the underground path of the lava tube

Detailed Description
June 4, 1998. Aerial view to NW shows the underground path of the lava tube that leads from Pu`u `O`o (6 km in distance) over the steep pali (foreground) and to the sea. The tube's path is marked by the blue-colored fume that rises from skylights and several other weak points in the roof of the tube.
Sources/Usage
Public Domain.