The team descends into the secret Mormon mine entrance. Traversing a labyrinth 250 feet below the surface, the team finally finds the Keyhole Chamber -- and uncovers the truth about the Aztec gold.

James and Josh continue to decipher clues from the Rhodes journal map in their search for the mysterious Golden Staircase. When they find an imposing stone door that may lead to the staircase, Eric has a plan for how to penetrate the massive structure.