Lost Gold of World War II

American treasure hunter John Casey returns to the Philippines with a new team and new technology, in a continued effort to solve one of the greatest mysteries of World War II.

With new evidence suggesting the location of a possible treasure vault beneath the waterfall, John is determined to find a way in; but mother nature is wreaking havoc on his plans.

Exploration of the tunnel is put on hold after an explosive find. Meanwhile, another promising clue at Breach 6 leads Rick to believe they're on the right track.

Left with no other option, John plans to drill across the mountain to get underneath the waterfall, but the weather won't make this an easy task. Meanwhile, Rick finds an artifact at Breach 6 that could confirm Japanese military presence.

While John and Rick work to decipher a Golden Lily map, Breach 6 reveals its first piece of treasure. Meanwhile, Levi and Geo come up with a creative solution to get past a mysterious collapse in the tunnel.

As the team finally gets to the bottom of Breach 6, startling new evidence suggests they might be too late. Meanwhile, the miners trigger a hazard in the tunnel that threatens their safety.

When a dead end in the tunnel threatens to close the door on exploration, a back door opens. Using their recently decoded Golden Lily map, the team discovers new access points, hoping to get under the waterfall by any means necessary.

In the season finale, the team finally reaches the void space under the waterfall, giving them a glimpse of what lies inside. But excitement is short lived when unexpected visitors get in the way.