Some of the advocates of these doctrines teach a limited duration of conscious suffering for the wicked after death, after which time they are annihilated. There are many passages that refute annihilationism. Indeed, if actual suffering is lacking, then so is punishment. And suffering necessarily entails consciousness. Annihilation means the obliteration of existence and anything that pertains to existence, such as punishment.
Annihilation avoids punishment, rather than encountering it.
There are many evidences. For example, consider the fact that there are no degrees of annihilation. One is either annihilated or one is not. These are incompatible concepts. We must emphasize that torment cannot, by definition, be anything but conscious torment.