The Deep Ones are fictional creatures in the Cthulhu Mythos of H.P. Lovecraft. They made their debut in Lovecraft's 1931 novella "The Shadow Over Innsmouth". They are described as being an ocean-dwelling, as evidenced by their name, race with an affinity for mating with humans. Apparently the deep ones have some command of fish as they entered a contract with the people of Innsmouth to keep the fish plentiful in their area. They also seem to have a supply of gold artifacts of unearthly design.