“Signature check?” Zeldman asked Sonar, conscious of Brentwood moving over from the periscope island, watching the “shattered ring” pulse on the pale green screen.
“No known signature,” replied Sonar, moving his head closer to the console, working the constant compromise between volume and tone needed to discriminate one noise from another in what nearly everyone but a sailor assumed to be a quiet domain. In reality the sea was a never-ending “frying pan” of energy, a night jungle of noise, countless billions of shrimp, microscopic organisms, clicking and sizzling amid the eerie haunting trumpets of the giant mammals in constant search for food.
“Could it be using baffles?” put in Brentwood.
“Signature pattern congruent with full hull, sir.” He meant that there was no sign of the kind of blistering effect on the outer ring of the echo pulse that might indicate symmetrical baffles.
“Put it on the PA,” Zeldman ordered Sonar. “Squelch button.” The next second all the crewmen in the control room could hear the muted engine sounds of the unknown surface vessel. Zeldman was ambivalent about the procedure. Sometimes he thought it only made everyone more edgy, but he’d been told by Brentwood how putting incoming noise on the PA, provided it wasn’t loud enough to send out its own pulse reverberating through the hull, could sometimes help the sonar operator. Those enlisted men who had been sailors in civilian life could not only help identify the vessel type but sometimes even luck out on its probable nationality. This could save a captain or his executive officer from ordering a preemptive launch of a torpedo or Tomahawk cruise missile, which, while it would almost certainly take out the oncoming vessel, would also end the submarine’s greatest weapon, its silence, revealing its exact location.
The UCV speed was now showing twenty knots on the digital readout — too fast for most noncombat vessels. But Brentwood knew that in trying to maintain the U.S. Navy’s “rollover” strategy — rolling over all obstacles, including Russian sub packs, in order to get vital resupply to NATO and Europe — the United States had made up for lost time with an industrial miracle that even dwarfed previous Japanese achievements. The industrial “miracle,” spurred on by uncertainty about the level of Japan’s commitment to the war effort, beyond her helping to ferry American troops across to Korea, was that the U.S. East Coast shipyards and those in San Diego were producing “prefab thirty-thousand-ton merchantmen,” called “Leggo ships” by the submarine crews, at the rate of one every seven days. It wasn’t as fast as the one Liberty ship every four days achieved by the American Kaiser Shipyards in World War II, but for a computer age, it was impressive, the Leggo ships stronger because of the laser spot welding, and faster.
Brentwood put it to Zeldman and the RO that it was quite possible the noise they were hearing was that of a Leggo. With the merchantmen rolling off the slipways at more than three a week, there was no way, he pointed out, that Roosevelt’s computer could have all Leggo noise signatures in its memory. Each time the subs returned from patrol, they were routinely issued the top secret taped signatures of the thirty-five Leggos built in the yards during the patrol. Besides, the moment the merchantmen were completed, they were pressed into service, without the normal time set aside for sea trials during which the noise signatures of ships were normally taped and refined to register any changes made by the yard-birds.
“Could be one of ours,” conceded Zeldman, watching Brentwood’s expression, trying to anticipate which course of action he would take.
“Forty-three hundred and closing,” came Sonar’s coolly modulated tone. The ship was coming right for them. In just over seven minutes it would be directly over the Roosevelt, now lying still, on listening mode only.
Brentwood ordered everything closed down except the “coffee grinder,” the reactor at the very heart of the sub that not only powered the Sea Wolf but which would take hours to fire up. Zeldman was worried that Brentwood was placing too much faith in the anechoic paint layer on the hull, which absorbed sonar pulses from another source, thus minimizing, sometimes eliminating, echo ping and so denying a hunter any “noise scent” at all.
Suddenly, with each man silent, rigid, as if welded to his post, the submarine seemed to shrink inside. It was true that for the men who had experienced life in the old diesel-electric subs and for one or two who had served, when very young, in the last boats of World War II, the Sea Wolf was infinitely more spacious. Curtained for privacy, individual bunks in nine-man dormitories, good-sized lockers beneath, rack space large enough to hang a full dress uniform, a soundproofed audio booth and video room for two movies a week, the modern Sea Wolf was a limousine compared to a standard sedan. Still, for most of the crew, who didn’t know the old pigboats, who hadn’t experienced what it was like at the end of your watch to have to roll into the sweat-soaked bunk of your replacement, and, except for the cook and the oiler, to be allowed only one three-minute shower a week, the Roosevelt was still crowded. Every now and then even a fully trained crewman would crack from what was euphemistically called DCS — developed claustrophobia syndrome.
As he listened to the heavy, gut-punching throb of the approaching vessel, it occurred to the hospital corpsman that perhaps Evans hadn’t had the DTs after all. Maybe he’d cracked under the strain of such claustrophobia. No matter how much bigger the Roosevelt was, compared to the old pigboats, it was still a submarine, with every available space jammed with equipment, including lead shot which could be jettisoned to accommodate new equipment so as not to alter the sub’s buoyancy. The corpsman knew that by any landlubber’s reckoning, the sub was still a long, steel coffin, and every man aboard knew that below her “crush” depth of three thousand feet, the enormous pressure driving her toward the bottom at over a hundred miles an hour, the sub would implode — flattened like a beer can beneath a boot.
“Two thousand and closing,” reported Sonar, his voice not so steady now, and hoarse, the sound of the UCV’s props increasing, having changed from a deep, rhythmic pulse to a churning noise that now seemed to be coming at them from every direction.
“Torpedoes ready?” asked Brentwood.
“Ready, sir,” confirmed Zeldman.
Brentwood glanced up at the fathometer. They were in shallower water. It made him more vulnerable to shock waves from any explosion.
“Set forward one and two for SI. Stern five and six for SI,” ordered Brentwood, quietly and distinctly, his command heard clearly in both forward and aft torpedo rooms, the fish being set for SI, or sensor impact, the unknown surface vessel now so close that the trailing wires which normally ran back from the torpedoes to the sub need not be used — the close proximity of the oncoming ship in effect a point-blank target for the twenty-eight-mile Mark-48s.
“Fifteen hundred. Closing,” came Sonar’s voice. “Speed increasing to twenty-seven knots. Most likely a cruiser, Captain. Friendly or not, I can’t tell.”
The choice for Brentwood was clear and stark. Under the authority of chief of naval operations, he could risk attacking any UCV if the UCV had not been identified by signature. In the cruel equation of war, the risk of sinking a “friendly” did not come near to the cost of losing a Sea Wolf, with its capacity as “platform of last resort” to take out a minimum of twenty-four major Soviet cities and/or ICBM “farms” from over two and a half thousand miles away. Yet Brentwood knew that even if the ship wasn’t using a chopper-dangled sonar mike because of the vicinity of its mother ship’s noise, if he fired, the UCV’s on-board sonar would instantly have his precise position. He could then expect to be dumped on by a cluster of “screamers,” as the U.S. sailors called the Soviet RBU—Raketnaya Bombometnaya Ustanovka—antisubmarine rockets. Fired in paired sequence from twelve-barrel horseshoe-configuration launchers, the five-foot-long, forty-two-pound warheads would rip the Roosevelt apart. The later models, being fitted by the Soviets with World War II-type Stuka dive-bomb whistles, were given the name “screamers,” and their noise, traveling much faster underwater than in air, struck deep into the collective psyche of all NATO submariners.