What I learned in the dark

adventures in Mount St. Helens lava tubes

Last week I walked a mile and a half in underground in the dark. The Ape Caves are the third longest lava tubes in North America, formed during an eruption 2,000 years ago at Mount St. Helens. The tubes formed when the top layer of lava cooled enough to harden while molten lava inside kept moving through, leaving an empty space behind. Walking through, …