This movie is well worth watching. Not just a horror film, but a real look at societies & how people treat each other. The Pit, a multi level type of prison, houses people who have been sent there for crimes & people who signed up to go there. It is never explained why anyone would voluntarily go, but I assumed it was because they didn't understand what they were getting into. Food is the currency- because the upper levels of the Pit begin eating from a giant platform of food. By the time it reaches many levels down, there isn't any food left. People kill themselves, each other & at the lower levels, resort to cannibalism. The idea is that if each level rationed their own food, there would be enough for everyone. Kind of brilliant idea for this type of storytelling. However, human nature being what is is, it's very difficult to talk the people on the upper levels to ration their intake, thereby leaving food for people on the lower levels who will starve. Prisoners are forbidden from hoarding food & every 30 days they are assigned to a new, randomly chosen level. It is gory & frightening, but also tells an interesting story. Cinematography was excellent. Acting very good.