A rich amateur treasure hunter assembles an expert group to investigate a possible location for the legendary Yamashita's Gold -- lost treasure looted from across Asia by Japanese forces during World War 2. Venturing deep into the jungles of a remote Indonesian island, the group finds itself under attack and forced into an apparently abandoned mine... only to become trapped underground in a Japanese Imperial Army bunker. They quickly realize that they are not alone, and face a desperate struggle to escape, or fight to the death...