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Aerial view looking west of East Pond Vent, largest on floor of Pu`u `O`o's crater. Lava pond actively circulates, and glow visible at night comes from lava appearing from under thin crust floating on pond.
Looking into skylight in roof of PKK lava tube. Deeper color is lava, darker is incandescent wall of tube, and brighter is sunlight on roof and wall of tube.