On the Big Island
Pepe'ekoe Scenic Drive North of Hilo
River Exits Underground Lava Tube
There IS light at the end of the tube!
Dim light in the distance indicates the serpentine course of the river.
Lava tubes are formed down in the center of a large lava flow when the
outer sections of the flow begin to cool and solidify. The lava in the center
retains its heat and gravity pulls the molton rock down hill. If the lava remains
hot enough to continue its journey down hill at the end of the eruption, an empty
tube remains.
Here's a link to more detailed information.
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The waters of this river rush into rock-strewn rapids after leaving the lava tube.
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