This is pretty cool. “Far Below” was written by Frank Barbour Johnson in 1939*, and it is remarkable how close it matches up to a modern Cthulhu Mythos story. It’s not officially part of the Mythos, although Johnson name-drops Lovecraft in the story and it’s blatantly obvious that the tale draws from “Pickman’s Model.” This radio play is a decent adaptation, although they had to add a character because the original is essentially a monologue.
Check it out.
*You can find the story in the collection below. Well worth the five bucks all on its own, as I’ve said before.