Warren Price ( Les Loveday ) , the son of a millionaire , is on a mission to explore a former Japanese military bunker on the island of Una-Una , Gulf of Tomini , Sulawesi , together with Japanese scientist Rie ( Miki Mizuno ) , and Price 's girlfriend Su-Ling ( Carmen Soo ) . They are escorted by a team of mercenaries , consisting of Captain Tino Prawa ( Ario Bayu ) , Djoko ( Joe Taslim ) , Richard ( Mike Lewis ) , and Sergeant Papa Snake ( Jaitov Tigor ) . After being ambushed by pirates , the group are forced inside an abandoned Japanese military bunker where they become trapped . Wounded and desperate , they descend into the mine in search of a way out . It is revealed that Price actually wants to search for Yamashita 's gold in the mine . Their search leads to some surprising findings ; it transpires the bunker is a chemical and biological weapons research facility ( based on Unit 731 ) where the Japanese used prisoners of war as subjects for experiments . Worse yet , these monstrous test subjects still inhabit the mine . The treasure quest turned into a mission of life and death , the team must face these mysterious and deadly enemies
Unit 731
Unit 731
Dead Mine