Lt. Commander Paul Boland - The 101st Fleet’s executive officer and commander of the salvage ship Martha Ann .
Captain Orl Cinana - The officer in command of the fleet of salvage ships. The captain was having a secret affair with Adrienne Hunter, which enabled Frederick Moran, otherwise known as Delphi, to blackmail Cinana into spying for Delphi's cause.
Commander Burdette Denver - Aide to Admiral Hunter and cousin of Rudi Gunn of NUMA.
Commander Felix Dupree - Captain of the top-secret prototype nuclear submarine USS Starbuck .
Al Giordino– Assistant Special Projects Director for NUMA.
Adrienne Hunter - Daughter of Admiral Hunter and old romantic liaison of Dirk Pitt's.
Admiral Leigh Hunter - Commander of the 101st Salvage Fleet, assigned the task of undercover recovery missions for the U.S. Navy.
Dr. Lavella - A prominent physicist and follower of Dr. Frederick Moran who specialized in the science of hydrology and helped make the colonization of the seamount possible.
Frederick Moran (Delphi) - Described as a giant of a man over 6'8" tall with hypnotic yellow eyes, Moran is the father of Summer Moran and the son of Dr. Frederick Moran, the original discoverer and colonizer of the seamount Kanoli. Moran's father was known as the Oracle of Psychic Unity, who as one the century's great classical anthropologists advocated the theory that the human mind would be the crucial factor in man's eventual extinction. Moran the younger assumes the identity of his father becoming known as Delphi or the Oracle of Delphi.
Summer Moran - A beautiful young woman in her 20s with blazing red hair, Summer Moran is the daughter of Delphi, otherwise known as Frederick Moran. She mistakenly attempted to abduct and assassinate Dirk Pitt, but later discovered that she had romantic feelings toward him and was instrumental in saving Pitt's life several times over. Summer apparently perishes at the end of their adventures at the Kanoli seamount. However, it is revealed in Valhalla Rising, set approximately twenty-three years later, that Dirk Pitt and Summer had an assignation sometime during the events of Pacific Vortex! that led to Summer becoming pregnant and giving birth to fraternal twins Dirk and Summer Pitt, named after their father and mother respectively.
Dirk Pitt– Special Projects Director for the National Underwater and Marine Agency (NUMA)
George Papaaloa - Director of the Bernice Pauahi Museum of Polynesian Ethnology and Natural History. He has been encouraging Pitt to search for the tomb of the Hawaiian King Kamehameha, who is rumored to have been buried in an underwater cave. He tells Dirk Pitt of the myth of the island of Kanoli rumored to be located to the north of the main Hawaiian Islands.
Dr. Roblemann - A renowned surgeon and follower of Dr. Frederick Moran, who was experimenting on a mechanical gill system so humans would be able to absorb oxygen from water.
Admiral James Sandecker– Chief Director of the National Underwater and Marine Agency.
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