The World, the Flesh and the Devil
Harry Belafonte stars in this 1959 tale about a miner who manages to rescue himself after a cave-in, only to realize that during his time underground most of the population was irradiated out of existence. He heads to New York City where he finds not much in the way of human survivors, but does realize that racism has somehow managed to transcend the end of the world. Rent or buy on Prime Video.