The Deep Ones are an amphibious race that primarily serve the two beings known as Father Dagon and Mother Hydra, but also have strong ties to Cthulhu. Locked in the timeless depths of the sea, their alien and arrogant lives are coldly beautiful, unbelievably cruel, and effectively immortal. They are a marine race, unknown in freshwater environments, and globally have many cities, all submerged beneath the waves; one is off the coast of Massachussets, near Innsmouth, called Y'ha-nthlei, while other sites, such as Y'lu-Y'loa (off the British Isles), K'toch (off Northern Europe), and Y'ha-gom-loa (off Antarctica) are said to exist.

Deep Ones are immortal until slain (so are any hybrid offspring), and may be worshipped by humans. From time to time, the Deep Ones establish and foster relationships with isolated human communities, offering to trade golden treasures from the depths of the sea, along with bountiful fish catches, in return for certain promises. Such communities eventually fall under the grip of the Deep Ones, and any dissent either evaporates or is fiercely dealt with. Such humans willingly accept the Deep Ones as their master, as the gift they bestow are wondrous (at least, at first), and their god's will is demonstrable in both tangible and beneficial terms - in comparison to human religions based purely on faith alone. Such targeted communities, already rundown and desperate, are eager to accept the riches, food, and promise of immortality offered by the Deep Ones, and, consequently, readily accepts the worship of Dagon, Hydra and Great Cthulhu. In Innsmouth, the Deep Ones' imposed religion was know as the Esoteric Order of Dagon, although elsewhere around the world the names of such orders may vary.

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