A team of scientists uncovers an ancient civilization in an uncharted area deep in the Grand Canyon that are ruled by savage warriors, human sacrifice and a mythological monster. The scientists struggle to survive the trial of the Aztecs and escape the ritual of evil.

The lure of the unknown and a love of adventure drew John Wesley Powell and his crew of nine to the last uncharted waters of the American west in 1869, Their goal: to be the first to ride the mighty Colorado River through the Grand Canyon and map its unexplored territory. Experience the explorers' harrowing descents through furious rapids and their wondrous discoveries on land as they overcome treacherous white eater, blistering heat, and near starvation,...