Kula Kai Caverns (Visit this link)

Kula Kai Caverns are located down slope
Mauna Loa near South Point on the Big Island of Hawaii. Kula Kai Caverns offers a spectacular adventure inside 1000 year old lava tubes. Situated on the Southwest rift, the caverns consist of several miles of braided lava tube systems.

Hike with our experienced guides and explore this fascinating underworld environment. If you are new to cave explorations, we promise you will be hooked with this unique experience. Just a few hours of making memories will last a lifetime! To the experienced caver, we will inspire you with a look into this valuable biologic and geologic resource. On-going research of these caves is providing greater insight into Earth's evolving nature.

http://www.kulakaicaverns.com