In the middle of the South Pacific, a thousand feet below the surface, a huge vessel is unearthed. Rushed to the scene is a team of American scientists who descend together into the depths to investigate the astonishing discovery. What they find defies their imaginations and mocks their attempts at logical explanation. It is a spaceship, but apparently it is undamaged by its fall from the sky. And, most startling, it appears to be at least three hundred years old…Has the ship come from an alien culture? From a different universe? From the future?  Why, initially, are there no creatures on the sea floor, and then suddenly, swarms of impossible animals of whole new species?  Who – or what – is transmitting messages onto the scientists’ computer screen…messages that grow increasingly hostile? What is the giant, perfect, metallic sphere, clearly not made by man and seemingly impenetrable by him – that they find in the spaceship? And what – most crucially – is the erxtraordinary, terrifying power that threatens their undersea habitat, and then their very lives…