text: Bones and Booth go down to the tunnels that run underneath Washington, D.C. to investigate a body. They find out the body was a women documentary maker. She was making a film about the people who live underground. One of the suspects was man, who lives underground. Bones found a crate in his house, that had bloody clothes, and a camera. After talking to him, they find out he gave her something, and he is convinced that is the reason she died. They find a amulet with her things and soon discover it goes to a vault. In the show, they said that during the 1800's the American government had vaults full of precious items hidden in vaults under Washington. Some of the vaults were never found due to cave ins. So Bones and Booth try to find the vault. Along the way they discover another body. This one being from the Civil War. They also find that the documentary maker hired two rock climbers to help her find the treasure. Bones and Booth soon realize that one of the climbers had killed the women. Before they can arrest them they have to find them. They both believe they are in the vault. So underground they go. They find the two in a vault loading gold into bags. Bones finally gets to point a gun at someone. In the end one of the climbers killed the women because of greed. The first suspect was released and went back underground.