Cold War Cave? Idaho Lava Tube Rumored as a 1960s Fallout Shelter

I ventured into a massive lava tube in Central Idaho—an underground world shaped by ancient basalt flows. In some areas, this tube rises up to 40 feet high and features two ladders that lead to upper levels, as well as a low crawl space that connects to a darker side passage. Local records indicate that it was once considered a potential fallout shelter site in the 1960s, so I wanted to explore what remains, its structure, and what the Cold War might have left behind.

In this point-of-view exploration, you’ll see natural lava features, including ropey pahoehoe formations, breakdown piles, and skylight zones. I’ll take you through the climb to the higher levels and the narrow crawl space. I also discuss safety considerations, the gear I carried, how lava tubes form in Idaho’s volcanic fields, and the backstory behind its designation as a fallout shelter.

**Safety note:** Caves can be hazardous. Do not enter without proper training, permission, and equipment. Always pack at least three independent light sources and never explore alone.

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