What happens to citizens of the world state when they die?

Their conversation about the crematorium also signifies the social control that the state has created. They do not fear death or analyze any philosophical conundrums about life and death. They cannot even fully comprehend what it would mean to be a member of a different caste. Lenina and Henry both agree that it would be worse to be an Epsilon or a Gamma than it would be to die. Death, as Henry puts it, is simply another way to benefit society.
***from another source