The Eternal City

Seven generations from now an island rises out of the ocean between Brazil and Africa. Archaeologists are stunned to find the ruins of an unknown city. Chaz Newcomb and his team arrive to begin a dig, but are forced to abandon their work when all but he fall into a mysterious trance. There is only one way to identify the city: go back in time and visit it before it disappeared. Once again, the Auckland's and the CT 9225's crews combine their efforts. Their quest takes them to the dawn...
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Seven generations from now an island rises out of the ocean between Brazil and Africa. Archaeologists are stunned to find the ruins of an unknown city. Chaz Newcomb and his team arrive to begin a dig, but are forced to abandon their work when all but he fall into a mysterious trance. There is only one way to identify the city: go back in time and visit it before it disappeared. Once again, the Auckland's and the CT 9225's crews combine their efforts. Their quest takes them to the dawn of humanity where they encounter the last of the Neanderthals, about to go extinct. They also find the lost city, inhabited by an unknown species of humans with amazing technology. The inhabitants have been overtaken by a trance, all but Carolus Nukium, and the city's three leaders, a set of triplets that call themselves the Triumvirate. When the city sinks below the sea, the Triumvirate goes into stasis; reappearing 12,000 years later at the archaeological dig. There, they discover that humans can now time travel and head for the Time Institute to seize its technology, knowing it will make them invincible. The crews follow in hot pursuit with no idea of the price they are about to pay.