Medusa / Cussler, Clive

After an undersea lab conducting research on a rare jellyfish known as the blue medusa mysteriously disappears and a bathysphere harboring Joe Zavala is attacked by an underwater vehicle, Kurt austin puts the NUMA team on the case.

Kurt Austin and Joe Zavala are off on a high-stakes adventure when the NUMA team is assigned to find the link between a missing top-secret, government-sponsored undersea lab that had been testing viral weaponry and an attack on a bathysphere near Bermuda that nearly killed Zavala and everyone else aboard.