“Report, First Officer,” he snapped, ducking through the hatchway.
His executive officer, Lieutenant Hayao Kakizaki, looked forward from his position at the periscope standard. “Sonar contact, Captain-san. Submarine target, bearing zero five zero degrees off the starboard bow. Estimated range twenty-five thousand meters. Plot has been initiated.”
“Status of the boat?”
“Upon verification of the contact, I ordered the battery charge secured and reverted to electric propulsion. Snorkel and communications masts have been retracted and, as per your posted orders, we have commenced an immediate descent to one hundred meters.” Rather breathlessly, the junior officer completed his report.
Ichijo gave an approving nod. “Very good, Hayao. Now get her leveled out and let’s see who we have out there.”
This was what the Harado was here for. She was one of half a dozen SDF submarines strung out in a picket line along the Ryukyus, seeking to contain any breakout attempt by the Chinese into the North Pacific. It appeared now as if the deployment had been a wise precaution.
The submarine commander took a step and a half across the cramped confines of the control room to the main chart tank. Lifting a command headset from the rack around its perimeter, he settled the phones over his ears and then looked down into the three-dimensional holographic projection beneath the tank’s glass surface.
Off to the east of the SDF sub, sketched in luminous blue hasure lines, was the Aichi Shima seamount. A stillborn island of the Ryukyu chain, it was a great steep-sided ridge of basalt, reaching upward from the ocean floor two thousand feet below to within two hundred of the surface. Off to the west was the green track of a fishing trawler going about its lawful occasions. Almost due south was the plot of the bogey, a glowing yellow dot-V trailing a course line and flanked by a Kanji data blurb: “Course, 010 degrees true. Speed, 12 knots. Depth, 80 meters.”
As Ichijo watched, the plot changed from warning yellow to hostile red.
“Sonar Control, this is the Captain. Do you have an identification on the plotted target?”
“Affirmative, Captain-san. Blade count and plant noise indicates a single-screw vessel using nuclear propulsion.
Matchup with audio signatures library indicates a high probability that the target is a PRC Han-class attack submarine.”
“We’ve got him, Hayao. Sound general quarters, silent mode.”
A soft, but urgent, electronic tone sounded within the confines of the Yuushio-class submarine and the overhead lights pulsed in synchronization, sending her crew hurrying to their stations.
“Torpedo room. Tube status?”
“Standard load-out in all tubes, Captain-san. GRX-3 dual role torpedoes in one, two, and three. A decoy pod in number four.”
“Very good. Power room.”
“Hail”
“What is our battery state?”
“We have not completed recharge. Seventy-three percent available on all banks.”
“It will have to do.”
First Officer Kakizaki joined him at the chart tank.
“The ship is closed up at general quarters, Captain-san, and we are leveled off at one hundred meters. We are steering one eight zero. Speed six knots.”
Ichijo nodded and continued to stare down into the display like a monk meditating at a pond. The Chinese Han and his own slower-moving vessel were running on almost diametrically opposed courses that should shortly have them passing abeam of each other at a fairly close range.
Given the Han’s rate of speed, its passive sonar had probably failed to detect the Harado, even though she had been snorkeling on her diesels. With this tactical situation, it would be a fairly simple thing to drop into the Han’s baffles, the kill slot directly behind the Chinese sub. However, Captain Ichijo had larger game in mind.
“Sonar control, is there any indication of a second target?”
“Negative, Captain-san. Only the initial contact … Wait a moment … Blade count and plant noise levels are dropping … The target is slowing, sir.”
Ichijo nodded to himself. The Han was conducting a classic “sprint and drift,” entering the area at high speed and then decelerating to listen for potential threats.
Too late, my friend. Now that Harado had switched over to battery power, she was as silent as a shadow on the sea floor.
“Hayao, I’ll wager you that this fellow is clearing the way for that missile submarine.”
The younger officer nodded his agreement. “That would seem logical to me, sir.” He tapped the southern edge of the display screen. “He’s probably loitering around out here somewhere, waiting for the attack boat to sterilize this sector. Then he’ll spring in.”
“Precisely. And if we will hold this course and speed, he’ll probably come right to us.”
Ichijo’s grandfather had been at Nagasaki and had died a long, lingering death as a result. The Japanese sub commander found the prospect of killing a boatload of nuclear weapons most satisfying.
“Should we launch a communications buoy with a sighting report?” Kakizaki asked.
Ichijo frowned. It was a reasonable notion, but a buoy launch could produce enough transitory sound to give away their presence.
“Not yet, but program a buoy and have it standing by in the launch tube.”
“At once, Captain-san.”
The two undersea craft ghosted by each other at a meager mile-and-a-half range, the only difference in their passage being that the Han’s older-gen machinery produced just barely enough noise to be tracked by the Harado’s sensors.
The Japanese boat was now fully rigged for silent running. When it was necessary to speak, her crewmen whispered. When speaking was not necessary, they kept silent. All non vital systems had been secured, and even the air-conditioning plant had been powered down to bare-minimum life support.
The sub’s internal temperature began to climb rapidly as the waste heat radiating from bodies and equipment was trapped within the well-insulated hull. Shutting down the blowers also deprived the crew of that sensation of free air movement, so critical in maintaining the illusion of open space. The lurking specter of claustrophobia that haunts every submarine began to make its presence known.
“Sonar control. Any indication of a new contact?”
“Negative, Captain-ran.”
Ichijo and Kakizaki met each other’s eyes in a silent officer’s conference. “The missile boat could be waiting for an all-clear signal from the Han,” the First Officer suggested finally.
“At the ranges we’re dealing with, that would mean going active with their main sonar. I doubt they’d want to attract that much attention. I’d say they were working some kind of staged relay system. They’re taking their time about things, though.”
“Our last bathythermograph drop indicates a mild thermocline at about one hundred and twenty-five meters. Maybe he’s gone deep and is ducting underneath us?”
“Possibly. Let’s find out. Take us down another fifty meters.”
Minutes crawled by, accumulating into a fair portion of an hour. As Captain Ichijo looked on with growing tension and concern, his once sound tactical situation began to come apart. Even given the creeping speed of the two boats, the range between them was growing.
The angle-off was increasing as well and soon the Han would be slipping out of the arc of Harado’s lateral arrays and disappearing into her own baffles. The Chinese attack sub was also drawing closer to the potential shelter of the Aichi Shima seamount, and still there was no sign of the missile boat.