After this lava delta collapsed, new lava spewed from the tube like a fire hose into the ocean 60 feet below. This story appears ... Back home, Peter marked the puka, or cave entrance, on a ...

The Canary Islands not only boast the third largest volcano in the world, but also the largest natural underwater lava tunnel ... and a blend of dry and submerged cave sections.

Researchers want to know if volcanic lava tubes could support a moon base and they are looking for answers deep below ...

Approximately 700,000 years ago when molten rock erupted from a vent in nearby Hart Prairie, the mile-long Lava River Cave was formed. Today, visitors can explore the cave's cool, dark expanse by ...

Below are some of the top things ... there is tent camping at the Bivouac area. 3. Tour Lava Caves with a Naturalist Guide It ...