Nahuku (Thurston Lava Tube), Hawaii Island Thurston Lava Tube, a 500-year old lava cave located within Hawaii Volcanoes National Park. Lava caves like this are formed when a river of lava gradually builds solid walls and a ceiling. When the lava flow stops and the last of it passes downhill, a cave is formed. These caves can be a few feet high and only yards long, or they can stretch for miles with high ceilings. The Thurston Lava Tube is a fantastic example of a massive lava cave. . The solidified drips and waves of once-liquid lava rock clearly show the molten forces that created this cave. Your flashlight reveals beautiful shapes and colors of minerals leeching from the rock. A tropical rainforest awaits at the end of Nahuku.
This is one place where you definitely don't want to see the light at the end of the tunnel! LOL
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