Dead Mine is a 2012 English-language Indonesian horror film directed by Steven Sheil and starring Ario Bayu and Joe Taslim.
As they progress deeper into the mine, lights suddenly flash on (revealing a Rising Sun Japanese war flag) and a propaganda song begins blaring over the internal communication system, startling the explorers.
They continue exploring the seemingly abandoned Japanese base, discovering protective Hazmat suits, maps, and disturbing photographs.
Their search leads to some surprising findings; Rie reveals that the bunker was used as a chemical and biological weapons research facility (based on Unit 731) where the Japanese used prisoners of war as subjects for experiments.
The group breaks up into two separate units; Captain Prawa, Sergeant Papa Snake, Price, and Su-Ling go to search for a way out(and, of course, the gold in the process) while Djoko, Stanley and Rie remain behind to protect Ario.
Djoko discovers a chamber filled with human remains, including the horrifically mutilated corpse of the pirate from the beginning of the film.
Captain Prawa’s group is attacked by one of the creatures, which stabs Price, being shot several times in the process without effect, before Sergeant Papa Snake kills it with an improvised spear.
Captain Prawa and Sergeant Papa Snake discover a shrine filled with dozens of creatures dressed in samurai suits of armor—soldiers from the Japanese Imperial Guard given the same mutagenic compound.
The Imperial Guardsmen storm through the tunnels, executing the gas mask wearing Japanese soldier as the rest of the group flees.