Raven, at the right of the formation, featured a suite of electronic listening devices that would rival any Rivet Joint RC-135 spy plane. A myriad of antennas picked up both voice and telemetry transmission all across the radio spectrum; the computer gear stuffed into the rear compartments provided the onboard operator with real-time decoding of all but the most advanced encryptions. A second operator commanded a suite of gear similar to that found in Wild Weasel and Spark Vark aircraft; he could both detect and jam active radar units at roughly two hundred miles. The rotating dispenser in the bomb bay included four Tacit-Plus antiradiation missiles. Launched from just inside one hundred miles, they could either fly straight to a known radar site or orbit a suspect area until the radar activated. A thick, eighteen-inch section had been added to the weapons behind their warhead. This new section had been designed specifically for the sea mission. The gear inside the area allowed the missile to use its active radar on its final leg if the target switched its own radar off. Though relatively weak and short-ranged, it was hard to detect and also difficult to jam. Once fully operational, the missile promised to make aircraft essentially invulnerable to surface ships—at least until enough missiles were used so that an enemy could figure a way around them.
The payload aboard Iowa, Bastian’s plane, was the reason the three Megafortresses were here.
Stuffed into Iowa’s forward bomb bay were a half-dozen fiberglass and steel container that looked like the old-fashioned milk containers once used to gather milk from cows on the copilot’s family farm. A thick ring that sat about where the handles would have been contained just enough air to properly orient the container’s “head” float a few meters below the surface of the water. Above the ring was a rectangular web of thin wires that, once deployed, 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.