The population here only receives some of their vital nutrients through liquids. They have sharper and larger teeth, and must eat each other to survive. There's no weapons. The average lifespan after the indoctrination process is 1 year. Because they are so extremely similar to each other, who lives and dies depends almost entirely on luck. One of them lived for 12 additional years and I ran numerous tests on it to determine what made them so successful. However, it turned out to be purely the result of chance.