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.