The 816 Nuclear Plant, also called the 816 Military Cave, is completely concealed within the Golden Mountain. It was once an actual nuclear plant (now it's been decommissioned and is free of any radiation). The 816 Military Plant is a three-level cave system. Looking at the different floors, you can see how the functions of the plant were distributed and segregated like a maze. Sights to see include: the 816 nuclear military base, main nuclear factory cave, main reactor hall, nuclear waste disposal site, "bottom of the pit", central control room, exhaust tower, etc.