The hell of it was, tracking whales had turned out to be good training. They were stealthy creatures, not because they sought to avoid detection, but simply because they moved with great efficiency, and the submarines had found that moving in close enough to count and identify the members of individual pods or families was at least diverting if not exactly exciting. For the sonarmen anyway, Kennedy thought. Not much for weapons department…Laval's eyes focused on the waterfall display. He settled more squarely into his chair and reached for a grease pencil, tapping the third-class next to him.

"Two-seven-zero," he said quietly.

"Yeah."

"What you got, Junior?" the CO asked.

"Just a sniff, sir, on the sixty-hertz line." Thirty seconds Liter: "firming up."

Kennedy stood behind the two watch-standers. There were now two dotted lines, one in the sixty-hertz frequency portion of the display, another on a higher-frequency band. The electric motors on the Japanese Harushio-class submarine used sixty-cycle A/C electrical current. An irregular series of dots, yellow on the dark screen, started cascading down in a column under the "60" frequency heading like droplets falling in slow motion from a leaky faucet, hence the appellation "waterfall display." Junior Laval let it grow for a few more seconds to see if it might be random and decided that it was probably not.

"Sir, I think we might want to start a track now. Designate this contact Sierra-One, possible submerged contact, bearing settling down on two-seven-four, strength is weak."

Kennedy relayed the information to the fire-control tracking party fifteen feet away. Another technician activated the ray-path analyzer, a high-end Hewlett-Packard minicomputer programmed to examine the possible paths through the water that the identified acoustical signal might have followed. Though widely known to exist, the high-speed software for this piece of kit was still one of the Navy's most closely held secrets, a product, Kennedy remembered, of Sonosystems, a Groton-based company run by one of Frenchy Laval's top proteges. The computer chewed on the input data for perhaps a thousand microseconds and displayed its reply.

"Sir, it's direct path. My initial range estimate is between eight and twelve thousand yards."

"Set it up," the approach officer told the petty officer on the fire-control director.

"This one ain't no humpback," Laval reported three minutes later. "I have three lines on the guy now, classify Sierra-One as a definite submarine contact, operating on his electric motors." Junior told himself that Laval here had made his rep stalking HEN-class Russian subs, which were about as hard to track as an earthquake. He adjusted his headphones. "Bearing steady at two-seven-four, getting hints of a blade rate on the guy."

"Solution light," the lead fire-controlman reported. "I have a valid solution for tube three on target Sierra-One."