Lava Tubes

[leilaniguy]

Aloha Wendy, lava tubes often have cracks leading to the surface. If there is a cool breeze blowing up out of a crack in the earth, it's probably a tube. If it's near the surface, banging the ground with a sledge or a rock will produce an echo or ringing noise. Some folks I met in HPP once told me that in stormy weather they can hear the waves crashing in a tube under their lot.