Posted by Aran That's super cool! Are volcanic vents like that common or is it a rare thing? How do they form?
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I suspect they are somewhat frequent, although this is the only mine where we have come across one. This vent was close to 100 feet underground. When I've watched documentaries about volcanoes, they often show clips of vents. All that said, it was really neat to get inside. One thing I didn't mention in the video was that if you tapped on the "curtains" they would ring like an out-of-tune bell. I wonder if it's because of a high iron content?
Lava tubes are reasonably common. I've explored one outside of Flagstaff and I've heard of them in Hawaii.
If it weren't for Tony's keen eyesight, we would have walked right past it. I'm not sure how many other explorers, if any, have found their way into the vent.
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