Chad dives into the underwater passage, uncovering a direct path to the Keyhole Chamber. Eric returns from a meteorite site similar to their findings at Blind Frog. An intruder on the Ranch removes a mysterious piece of equipment.

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Duane Ollinger sinks everything he has into hunting for what he believes is a vast fortune of gold on his property; with each step he takes closer to finding the treasure, the land appears to hold on tighter and stop him in his tracks.

As Duane and crew explore the cavern they find themselves overcome by a deadly and invisible gas cloud. Complications with their rescue leaves them wondering if they will make it out alive.

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

Trespassers prompt Charlie to increase security on the ranch.

Disaster strikes when Duane and Charlie attempt to drill down a smoke vent at the Bead Site. Chad and Josh follow the fault line back to the collapsed mine. Eric explores an indigenous site in Ohio that holds clues to Blind Frog Ranch.

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.

After the crew drills into a dry cavern, they must devise a plan to protect themselves from radioactivity and poisonous gasses; but as they get close to finally entering the cave, trespassers descend upon the ranch.

Chad and Eric discover an abandoned mine deep in the mountains and suspect they are being stalked. At the Bead Site, the team unearths evidence of sacrifice.

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

The results from radiocarbon testing are in, which will tell Duane if the box is Aztec or not. Then, the men discover they are being surveilled by a high-tech camera mounted just above the cave entrance.

After a long winter, the crew returns to Blind Frog Ranch to strategize a new plan to get the box out of the underwater cave. And Charlie asks for help to investigate a mysterious death on the ranch.

Determined to get into the cavern, Duane and his team explore new methods to find a dry entrance; while Chad takes to the skies in search of a natural opening, Eric thinks the radioactive rocks found in the box might show them where to dig.

Searching for the hidden entrance to the cave system, the team uncovers an ancient vent shaft above the Energy Zone. But an explosion triggers an underground tsunami that threatens the cave system.

After hitting a meteorite deep underground while trying to drill into the cavern system, the team searches for an alternate route.

When an underground tsunami floods the cavern system, Duane and his team attempt to breach it from higher ground -- discovering evidence of Aztec artifacts and a crucial clue to the Lost Rhodes mine.

After uncovering a bar of gold at the Bead Site, Chad and James set out to research where it might have come from. With trespassers still threatening the ranch, their discovery sets them on the path of the fabled Lost Rhodes Mine.

Chad and Eric explore a deep cavern while Duane discovers smoke vents.

After Duane makes a costly mistake, Eric and Chad finally discover what they've been looking for. However, the crew gets caught in the cross hairs of mysterious intruders.

Now that the floodwaters have receded at the Energy Zone, the team prepares to resume drilling into the cavern system.

Eric and Chad encounter disaster while attempting to breach the void in the South Cave. A mysterious rumbling shakes the ranch, and James finds evidence of the Aztecs at the Bead Site.

Chad and Eric find signs of gold at the abandoned mine, but nightfall brings an unwanted stalker to their camp. At the Bead Site, the team unearths an ancient structure.

Following the trail of the Lost Rhoades Mine, Chad and Ryan attempt to rappel down a 250-foot cliff in a dangerous maneuver to access the Mormon Eye cave.