Emanuel Swedenborg, Heaven and Hell — Chapter LXI, The Appearance…
“ How great the number is of the hells I have been permitted to realize from knowing that there are hells under every mountain, hill, and rock, and likewise under every plain and valley, and that they stretch out beneath these in length and in breadth and in depth. In a word, the entire heaven and the entire world of spirits are, as it were, excavated beneath, and under them is a continuous hell. ”
