The Grand Canyon Caverns full tour! Located just a few miles east of Peach Springs, Arizona, lie 230 feet (70 m) below ground level. They are among the largest dry caverns in the United States. Dry caverns compose only 3% of caverns in the world. Because of the lack of water, stalagmites and stalactites are rare in the caverns. Air comes into the caverns from the Grand Canyon through 60 miles (97 km) of limestone caves, a fact discovered when red smoke flares were ignited in the caves, and two weeks later, red smoke was seen protruding from vents, near Supai, AZ, in the Grand Canyon.

During the Mississippian Period 345 million years ago, the southwest United States was covered by ocean. Skeletons of sea life settling to the depths, created a mud with a high percentage of calcium. This eventually hardened into the limestone bedrock seen in the caverns today. Over millions of years, the bedrock was pushed up to over 5,000 feet (1,500 m) above sea level.

Approximately 35 million years ago, rainfall flowed into the rock, and eroded passages that lead to the Colorado River and what is now the Grand Canyon. Millions of years later, the evaporating water left calcium deposits on the walls and floors, creating the formations that can be viewed today. Filmed by Brandon Smithey and Mark Miessner

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