What happens to the hell beings as the universe comes to an end?

This question was inspired by [an earlier one](https://buddhism.stackexchange.com/questions/51807/do-any-sub-sects-of-buddhism-have-the-concept-of-eternal-hell) . In [DN27](https://suttacentral.net/dn27/en/sujato?lang=en&layout=plain&reference=none¬es=asterisk&highlight=false&script=latin) , it was mentioned: > As the cosmos contracts, sentient beings are mostly headed for the realm of streaming radiance. I recalled hearing a Dharma talk ages ago that as a great aeon ends, all the lower realms are emptied (perhaps, destroyed?) and beings are reborn into the higher realms. This appeared to be what the above sutra is alluding to. Correct me if I am wrong. Does this mean that all the hell beings (even those in the lowest hell) will also be promoted to the higher realm? What happens to their bad karma, is it suspended? Or is the contraction of the universe halted until these beings had expired their bad karma?