Descent Into Europa

Book four of The Starman Saga. "Starman David Foster to the Silverfire."
"The mantaship has entered the water; it's like swimming in India ink."
"There's something out here with us. It's moving under it's own power."
"Sensors place it sixteen miles away. It's a life form more than a quarter-mile long."
"It's coming this way! We're taking a recording and getting out of here!" Danger Below! Buoyed by their discovery of the abandoned base on the planet Nyx, David Foster and the Starmen have intens...