The first great fantasy novel ever written. J.R.R. Tolkien, C.S. Lewis are but successors to William Morris. Tale of quest, adventure, magic and war set in an invented age and in the invented world of the author's own imagination. Lots of very old-fashioned archaic English.
A famous scientist, a young research zoologist, an American engineer, descend to the murky depths of the ocean. There, Horror rising from a black abyss severs their lifelines. As guest-prisoners they taste the desperate, dangerous life of a strange underwater community.