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. Meanwhile, the team investigates leads for other possible Yamashita treasure sites throughout the Philippines, uncovering evidence that any one of their 25 new treasure maps could lead them to the Lost Gold of WWII.

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.

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.

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.

Digging continues at Breach-6, but when the team unearths a possible water trap, excavation is put on hold. To find another way into the mountain, the team conducts a LiDAR scan that reveals a cave, perhaps used by Japanese soldiers during the war.

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.

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.

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.

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.