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Indian Tunnel entrance & skylight, Craters of the Moon National Park & Preserve, 2013.

The majority of caves within the monument are lava tubes. Lava tubes form when the cooling exterior of an active lava flow insulates the active molten river, allowing it to continue to flow. In this way, the cooled exterior remained in place while the lava continued to flowed until the source was cut off or diverted, leaving behind an empty space, or tube. The Indian Tunnel is large with many collapses in the ceiling that provide plenty of light for travel down the tube. At over 800 ft long and 40 ft high, the Indian Tunnel is one of the largest lava tubes within Craters of the Moon National Monument & Preserve.

U.S. National Park Service

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Craters of the Moon National Monument and Preserve, Code: CRMO

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Title: Craters of the Moon National Monument & Preserve
URL: https://www.facebook.com/CratersoftheMoonNPS?fref=ts

20140520

05/20/2014

Public Can View

Organization: Craters of the Moon National Monument & Preserve
Address: 19 miles West of Arco on Hwy 20/26/93, PO Box 29, Arco, ID 83213

Friday, December 9, 2016 1:20:54 PM

Wednesday, August 9, 2017 9:11:19 PM

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