would extend precisely 13.4 meters. The wires were attached to a line-of-sight radio transmitter that generated a short-rang signal across a wide range of bands. These signals could be received and processed by a specially modified version of the antennas and gear used by the Megafortresses while directing Flighthawks.
The bottom portion of the buoy contained three different arrays, the first was designed to broadcast audible signals that sounded like a cross between the clicks of a dolphin and the beeps of a telephone network. The second picked up similar audible transmissions in a very narrow range. The third transmitted and listened for long and extremely-low-frequency (or ELF) radio waves. These devices were actually relatively simple and while not inexpensive, were considered expendable — which was why the buoyant ring was equipped with small charges that would blow it off the buoy, sending them to the bottom of the ocean.
In essence, the milk cans were simply sophisticated transmitting stations for “Piranha,” the larger device strapped to Iowa’s belly. Piranha looked like an oversized torpedo with extra sets of fins on the front and rear. Once in the water, the conical cover on its nose fell off to reveal a cluster of oval and circular sensors that fed temperature, current, and optical information back to a small computer located in the body of the device. Between these sensors and the computer was a ball-shaped container that held a passive sonar; this too fed information to the computer, which in turn transmitted it, whole or in part, back to the buoy. The rear two thirds of Piranha contained its hydrogen-cell engine. Pellets made primarily of sodium hydride were fed into a reaction chamber where they mixed with salt water, creating hydrogen. This part of the engine was based on the hydrogen-powered, long-endurance, low-emission motor that powered an ultra-light UAV being tested at Dreamland. The sea application presented both major advantages — the availability of water allowed the compressed, pelletized fuel to be substituted for a gas system — and great challenges — the fact that it was salt water greatly complicated what was otherwise a fairly simple chemical process.
Rather than turning a propeller as it did in the ultra-light, Piranha’s engine was used to heat and cool a series of alloy connectors that ran through the outer shell of the vessel. Similar to a keychain or a child’s toy, the outer shell was connected in sections, allowing it to slip and slither from side to side. Using a technique first pioneered at Texas A&M, the expansion and contraction of the alloy strands moved the outer hull like a snake through water. The process was essentially wakeless, impossible to detect on the surface and almost impossible below. While there was still work to be down, the propulsion system was nearly as fast as it was quiet — Piranha could read speeds close to fifty knots, with an endurance of just under eighteen hours at a more modest average pace of thirty-six knots.
Piranha had been developed by a joint Navy and Dreamland team; it was represented the next generation of unmanned robes of UUVs (unmanned underwater vehicles) designed for launch from Seawolf submarines. Current UUVs used active forward- and side-looking sonars and had an overall range of approximately 120 nautical miles. They moved slowly, and could cover about fifty square miles of search area a day. They were fantastic weapons, intimately connected to the Seawolf and Virginia-class boats, and were perfectly suited for the inherently hazardous missions they had been designed for, such as searching for mines in littoral or shallow coastal waters.
Unlike those probes, Piranha could be operated from aircraft, thanks to the buoy system. Like the buoys, the probe itself was disposable, or would be in the future. For now, a low-power battery mode took it back to a specific GPS point and depth for recovery by submarine or surface ship up to 150 miles from rundown.
The data transmitted back to the buoys — and from them to a controlling airplane or vessel ship — was considerably greater than that possible in the current-generation UUVs, thanks largely to compression techniques that had been pioneered for the Flighthawk. These “rich” signals were difficult to decode and had a short range, which limited the ability of an enemy to detect and track them. in the stealth mode, which used only the intermittent audible mode to communicate, the operator received enough information to identify size, course, and bearings of an enemy target out to seventy-five miles, depending on the water conditions. In “full como,” or communications mode, the signal fed a synthetic sonar system. This sonar was passive, and thus completely undetectable. It painted a three-dimensional sound picture on an operator’s screen; the computer’s ability to interpret and translate the sounds into pictures of the object that created them not only meant that combat decisions could be made quickly, but the operators required considerably less training than traditional sonar experts. Just as the improvements in sensor gear and computers allowed the copilot on a Megafortress to perform the duties of several B-52 crew members, the synthetic sonar would allow a back-seater in a Navy Tomcat to handle Nirvana while taking negative G’s.
In theory, Colonel Bastian and his people were going to find out if the impressive results in static and shallow-water tests could be duplicated in the middle of the ocean, against some of the best people with Seventh Fleet could muster. The
If you’re going to test a new weapon system, might as well go against the best, thought Dog.
“Piranha Buoy in ten seconds,” said Ferris.
“Ten seconds,” said Dog. “Piranha Team, you ready?” he added, speaking over the interphone circuit to the Piranha specialist, Lieutenant Commander Tommy Delaford and Ensign Gloria English. They were sitting downstairs in what ordinarily was the Flighthawk deck on the Dreamland Megafortresses.
“Ready,” replied Delaford, the project leader for Piranha. Delaford worked directly for the Chief of Naval Operations, Warfare Division; his handpicked Navy team include people from N77 (the submarine warfare division), N775 (science and technology), and the Space and Naval Warfare Systems Command.
“I have Task Force Charlie,” said Captain Derek Teijen, piloting Galatica. “Tapping in coordinates — they’re a bit closer than they’re supposed to be, Colonel. Lead ship is barely one hundred miles away. Have it ID’s as a DDG. Carrier is sending two F-14’s toward us.”
“Roger that,” replied Dog. He’d expected the Navy to jump the gun; in a way, it was surprising that the task force had waited so long. The new Seventh Fleet commander, Admiral Jonathon “Tex” Woods, had boarded the aircraft carrier to personally oversee the tests. While his military record was sufficiently impressive for him to be known even in the Air Force — and hated to be shown up in combined-forces exercises.
Which in a way, this was.
“Zen, those Tomcats are yours if they get close enough,” Dog said. “Curly, stand by for launch of Piranha system. Chris, open bay doors.”
The Megafortress shook slightly as the large doors of the bomb bay cranked open. The sophisticated flight computer system compensated for the plane’s altered aerodynamics so swiftly Dog hardly noticed. He pulled back gently on the stick, pushing the plane exactly onto the
dotted red line the computer put on his screen.
“Three, two, one—” said Ferris.
There was a loud rumble from the rear as the buoy fell into the water.
“Device launch in twenty seconds,” said Ferris.
“We concur,” said Delaford. “Counting down.”
Dog pitched the big plane’s nose toward the waves; the optimum launch angle was a fairly steep forty-three degrees.
“Tomcats are looking for us,” reported Ferris. “Ten seconds to launch — we need more angle, Colonel.”
“Got it,” said Bastian, hitting his mark. The weapons section of the flight computer that helped manage the Megafortress projected the launch countdown in his HUD, “Launch device,” he said as the numbers drained to zero.
“We’re off,” said Ferris. “Over the river and through the woods, to Grandmother’s house she goes.”
Dog ignored Ferris’s attempt at cosmic relief and began to pull the plane upward. He’d had to drop fairly low to the waves for the launch, and the vision of sharks circling his dinghy returned. As they climbed, the Piranha team went through the shakedown procedure, establishing contact with the probe. They immediately began steering it toward the target task force. Traveling at just over forty knots, Piranha had already identified the ships in the group for the operators. She dove to four hundred meters, completely undetected by the screening vessels and the two ASW helicopters, which had set up a picket of sonar buoys. The operators detected a submarine operating a towed array-probably the
