A team of Americans explores a mountain in the Philippines to search for a treasure rumored to have been buried by Gen. Tomoyuki Yamashita in the closing months of World War II.
Digging continues at Breach-6, but when the team unearths a possible water trap the excavation is put on hold; the team conducts a LiDAR scan that reveals a cave, perhaps used by Japanese soldiers during the war.
After discovering a bomb marker, the team brings in an explosives expert to search a cave that may have been a headquarters of Gen. Yamashita during the war; a potential booby trap and the first hint of treasure.
The team triggers a possible water trap in the cave and is forced to stop digging; Martin Flagg believes the Story Rock indicates a tunnel behind a waterfall, and the team brings in a diver to explore the plunge pools for an entrance.
Unable to find a tunnel at the waterfall, the team is guided by an animal marker to a boulder carved in the shape of a turtle, which leads them to a golden lily symbol indicating a secret backdoor entrance.
The team attempts to prove if a tunnel exists behind a unique formation of rocks they believe is a secret backdoor entrance into the mountain.
As the team zeroes in on a tunnel that may be part of the treasure labyrinth, Bingo learns that part of dictator Ferdinand Marcos' fortune may have been stolen from Yamashita's treasure and uncovers a possible link to a CIA conspiracy.
Peter meets with a man who warns of the deathly risks in searching for Yamashita's treasure; the team clears the last obstacles and finds a secret tunnel directly into the mountain.
An advanced satellite scan of the mountain reveals metal deposits underground; the team targets three sites believed to be the access points to Yamashita's gold: a waterfall, a crater known as Breach 6, and a camouflaged tunnel.
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; information is revealed about the knife that was found.
Another promising clue at Breach 6 leads Rick to believe they're on the right track; John hits a roadblock on his search for a tunnel entrance near the waterfall, Bingo makes an incredible discovery that could lead him to Golden Lily treasure maps.
John plans to drill across the mountain; Rick finds an artifact at Breach 6 that could confirm Japanese military presence; Levi and Geo make a grim discovery in the tunnel; Bingo meets someone with rare and valuable knowledge.
Breach 6 reveals its first piece of treasure; Levi and Geo come up with a creative solution to get past a mysterious collapse in the tunnel; while drilling toward a possible treasure vault, John and Rob make a startling discovery.
As the team finally gets to the bottom of Breach 6, startling new evidence suggests they might be too late; the miners trigger a hazard in the tunnel, which threatens their safety; Bingo unearths alarming evidence a little too close to home.
