Mankind is on the brink of extinction. Earth is ravaged by nuclear explosions and the environment is compromised. The last stronghold of humanity is a single bunker, inhabited by the best of the best mankind can offer. Help those brave fellows survive the stress of being confined in such a tiny space by manipulating their social behaviour, while they wait for the radiations to fade away.
Not everything you can actually see is what it is. This might sound a bit abused as a statement but in this case ... it is NOT. Prepare to venture forth in a weird dimension made for deceiving your perception and smash your beliefs from their foundations.