Brian Lumley
"The nethermost caverns are not for the fathoming of eyes that see; for their marvels are strange and terrific. Cursed the ground where dead thoughts live new and oddly bodied, and evil the mind that is held by no head. Wisely did Ibn Schacabao say, that happy is tomb where no wizard hath lain, and happy the town at night whose wizards are all ashes. For it is of old rumour that the soul of the devil-bought hastes not from his charnel clay, but fats and instructs the very worm that gnaws; till out of corruption horrid life springs, and the dull scavengers of earth wex crafty to vex it and swell monstrous to plague it. Great holes secretly are digged where earth's pores ought to suffice, and things have learned to walk that ought to crawl..."
--Abdul Alhazred, THE NECRONOMICON (Brian Lumley, THE BURROWERS BENEATH)
He went on about monsters, sleeping in great caverns underground and especially under the sea, waiting for a chance to take over the surface world.
--Brian Lumley, THE BURROWERS BENEATH
His writing includes mention of the "blue-litten world of K'n-yan," of the "Vaults of Zin," of monstrous ruins of eldritch civilizations in a still deeper "red-litten world of Yoth...."
--Brian Lumley, THE BURROWERS BENEATH