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, 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.
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 group finds a possible backdoor. With ground penetrating radar, they find a void. They inspect the damage after a typhoon. They decide to drill for the void and may have hit Nazi Concrete.
The group decides to dig straight down to the flooded void. Bingo visits a man who sued the government for Marcos' confiscation of the treasures and leads them to possible CIA involvement.
Peter meets with a man who warns of the deathly risks of searching for Yamashita's treasure, and a connection to the CIA, as the team moves mountains to clear the last obstacles and finds a secret tunnel directly into the mountain.
