Duane won't stop until he gets his hands on the gold under his property.

Chad dives into a flooded cave system after a tantalizing discovery.

A mystery lurking underground forces the team to reevaluate their safety.

The team catches a break while trying to find a new entrance to the cavern.

Trespassers prompt Charlie to increase security on the ranch.

Duane uncovers a whole new mystery about the land he owns.

The crew return to the ranch to strategize a new plan to get the box out of the underwater cave. And, Charlie investigates a mysterious death on the ranch.

The results from the radiocarbon testing are in, which will tell Duane if the box is Aztec or not. And, the men discover they are being watched by a high-tech camera.

When a windstorm ruins visibility in the water, Chad considers a risky blind dive to extract the box. Plus, intruders are discovered on the ranch.

Chad makes a huge mistake that could prove costly. Plus, a shocking discovery inside the box forces Duane to rethink everything.

Determined to get into the cavern, Duane explores new methods to find a dry entrance. Meanwhile, Chad takes to the skies in search of a natural opening.

After Duane makes a costly mistake, Eric and Chad finally discover what they've been looking for. However, the crew gets distracted by mysterious intruders.

After the crew drills into a dry cavern, they must devise a plan to protect themselves from poisonous gases. But trespassers threaten their progress.

As the crew explore the cavern, they are overcome by a deadly and invisible gas cloud. It'll take a complicated rescue mission to get them out alive.

Duane and Chad Ollinger return to the Ranch to unearth $3 billion in hidden treasure. Claim jumpers invade the property, threatening to derail everything.

Searching for the hidden entrance to the cave system, the team finds an ancient vent shaft above the Energy Zone but are thrown off by an explosion.

When an underground tsunami floods the cavern system, Duane and his team enter it from higher ground - discovering evidence of Aztec artifacts.

After uncovering a bar of gold at the Bead Site, Chad and James set out to research where it might have come from and see if they can find more.

The team tries a dangerous manoeuvre on the trail of the Lost Rhoades Mine to access the Mormon Eye cave. Duane finds more poacher sites on the ranch.

The team resumes drilling into the Energy Zone. Duane takes a stand against the poachers. Charlie finds a dead animal with unusual bite marks on it.

While drilling into the cavern for Aztec gold, the team strikes an impenetrable object deep underground that reveals the truth about the Energy Zone.

After hitting a meteorite deep underground the team searches for an alternate route into the cavern. Chad discovers a clue that leads to a breakthrough.

Chad and Eric explore a cavern deep underground. Duane discovers smoke vents, and James travels to the Aztec capital in Mexico City.

Duane asks professional treasure hunter Josh Feldman to join their search for the Aztec gold. But a local tribal elder visits with a warning.