Austin looked up from the chart. “About eighteen hundred at last count. They range from a sixteenth-century wreck of TangierIsland to the Cuyahoga, a Coast Guard cutter that went down after a collision. But the historian at NUMA was clueless about the target the satellite picked up.”

“What kind of depth are we talking about?”

“The Chesapeake’s pretty shallow, for the most part,” Austin replied. “Averages about twenty-one feet, although it’s laced with troughs that reach nearly two hundred feet.” He tapped the chart with his finger. “From the looks of it, our target sank into one of these deep holes.”

The powerboat continued south, skimming over the tops of two-foot seas past oyster boats and sailing craft. There was a steady stream of traffic in both directions along the Intercoastal Waterway, which ran down the middle of the Chesapeake.

Less than an hour after leaving the boatyard, Austin again glanced at the GPS and signaled to Zavala, who backed off the throttle and steered the boat to follow Austin’s pointing finger. When they were on-site Austin pointed down toward the water and yelled:

“Here.”

The boat plowed to a stop and Zavala killed the motor. Austin set the GPS aside and threw the anchor over the side. The boat rocked in the waves a few hundred yards from a small island. The boat’s depth finder indicated that the water under their hull was forty-six feet. He and Zavala pored over the satellite photo Wilmut had provided. The faint outline of a ship was clear. It should be right under their hull.

Austin opened a plastic case and lifted out a SeaBotix Remote-Operated Vehicle that was about the size and shape of a canister vacuum cleaner. NUMA had ROVs that were as big as a car, and Austin could have drawn upon an array of the sophisticated remote sensing devices, but he wanted to move fast. He had decided against a time-consuming magnetometer or side-scan sonar survey in favor of a shallow-water vehicle that was portable and easily transported.

At one end of the bright red plastic housing was a high-resolution color camera and halogen lights. At the other end was a pair of powerful thrusters. The ROV had a lateral thruster that could shift it sideways and a vertical thruster for up and down. Metal frameworks on each side of the vehicle served a dual purpose as runners and housing protection.