dryfj.com / drycyclist.com (kevin cook)

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04498-lava-tube.jpg A recently installed sturdy metal ladder leads down into the Lava TubeThumbnailsA beam of warm desert light shines down through the ceiling into the main room at the Lava TubeA recently installed sturdy metal ladder leads down into the Lava TubeThumbnailsA beam of warm desert light shines down through the ceiling into the main room at the Lava TubeA recently installed sturdy metal ladder leads down into the Lava TubeThumbnailsA beam of warm desert light shines down through the ceiling into the main room at the Lava TubeA recently installed sturdy metal ladder leads down into the Lava TubeThumbnailsA beam of warm desert light shines down through the ceiling into the main room at the Lava TubeA recently installed sturdy metal ladder leads down into the Lava TubeThumbnailsA beam of warm desert light shines down through the ceiling into the main room at the Lava TubeA recently installed sturdy metal ladder leads down into the Lava TubeThumbnailsA beam of warm desert light shines down through the ceiling into the main room at the Lava Tube

So, what is this? The Lava Tube is just a big air pocket that formed when lava was flowing and cooling here.