American treasure hunter John Casey returns to the Philippines with a new team and new technology, in a continued effort to solve one of World War II's greatest mysteries. A satellite scan of the mountain reveals massive metal deposits underground.

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. Meanwhile, a clue uncovered at Breach 6 has the team going all in.

Exploration of the tunnel is put on hold after an explosive find. Meanwhile, as 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.

Left with no other option, John plans to drill across the mountain to get underneath the waterfall. Meanwhile, Rick finds an artefact at Breach 6 that could confirm Japanese military presence on the mountain during World War II.

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.

The quest for the one of the largest treasures in modern day history continues. The Lost Gold of World War II returns to resume the search for hundreds of billions of dollars of stolen loot supposedly hidden by Japanese General Tomoyuki Yamashita.