Skylight in lava tube carrying lava from ‘Alae crater onto to Kīlau...

Skylight in lava tube carrying lava from ‘Alae crater onto to Kīlauea's south flank, October 21, 1970. For much of 1970 and into 1971, lava flowed through a tube from Mauna Ulu into a complex lava lake in 'Alae Crater. The lake built natural levees, which allowed lake level to rise much higher than the old crater rim. Lava tubes developed in the levees as exits for lava entering the lake. This photo shows one such exit tube.