The abyss, it seems, had shelving shores of dry land at certain places; but the Old Ones built their new city under water—no doubt because of its greater certainty of uniform warmth. The depth of the hidden sea appears to have been very great, so that the earth’s internal heat could ensure its habitability for an indefinite period. The beings seem to have had no trouble in adapting themselves to part-time—and eventually, of course, whole-time—residence under water; since they had never allowed their gill systems to atrophy. There were many sculptures which shewed how they had always frequently visited their submarine kinsfolk elsewhere, and how they had habitually bathed on the deep bottom of their great river. The darkness of inner earth could likewise have been no deterrent to a race accustomed to long antarctic nights.
Decadent though their style undoubtedly was, these latest carvings had a truly epic quality where they told of the building of the new city in the cavern sea. The Old Ones had gone about it scientifically; quarrying insoluble rocks from the heart of the honeycombed mountains, and employing expert workers from the nearest submarine city to perform the construction according to the best methods. These workers brought with them all that was necessary to establish the new venture—shoggoth-tissue from which to breed stone-lifters and subsequent beasts of burden for the cavern city, and other protoplasmic matter to mould into phosphorescent organisms for lighting purposes.