After his failed attempts, Austin admitted to himself that the sea was just playing with him, and he paddled away from the reef to reconnoiter. As the inflatable rocked in the waves, he caught his breath. Then he extracted a lightweight, electric-powered outboard motor and battery from the pack, clamped the motor to the platform, and punched IGNITION. Except for a soft hum, the motor was almost silent. He goosed the throttle and aimed the inflatable’s blunt bow at the creamy surf welling up around the opening in the reef.

The inflatable bounced, fishtailed, and yawed. For a second, Austin gritted his teeth, thinking he was going to be thrown sideways into the jagged coral. Then the outboard’s propeller blades caught water, and the inflatable squeezed through the opening and glided into the peaceful lagoon.

Austin quickly killed the motor and waited. Five minutes passed, and there was nothing to indicate he had been detected. No blinding searchlights, no hail of bullets, to herald his arrival.

Austin took the lack of a warm reception as an invitation to stay. He dug his scuba gear out of the pack, buckling on his lightweight air tank and buoyancy compensator. He checked his GPS and saw that the inflatable had been thrown slightly off course after passing through the reef.

He began to paddle, until the little black triangle on the GPS’s screen showed he was back on course. A few minutes later, the triangle merged with the circle marking where the satellite showed the dark streak in the lagoon. The submarine he had seen in the satellite image seemed to have sprung from the floor of the lagoon before it vanished magically from sight. The inexplicable disappearance of the Typhoon suggested that there was more to the lagoon than met the eye. Austin had no logical reason to assume the lagoon’s waters were not as shallow as they looked from space, but he look no chances, and had borrowed a tank containing a Trimix mixture from the NUMA research vessel in the event that he had to make a deeper dive than expected.

Austin pulled on his face mask and fins, chomped on his regulator mouthpiece, hoisted himself belly down onto the inflatable’s right pontoon, then rolled off into the lagoon.

Water seeped between the neoprene and his skin and gave him a momentary chill until it warmed to an insulating body temperature. He held on to the side of the inflatable for a few seconds, then he pushed himself away, jackknifed as he dove under the surface, and descended about twenty feet.