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The Imperial Hyperspace Security Net was an overlapping network of hyperspace disruption technologies used by the Galactic Empire to control hyperspace traffic through the Deep Core.

Description
The Imperial Hyperspace Security Net was a system of gravity well projectors and non-mass HoloNet transceivers utilized as an early warning system by the Galactic Empire to detect starships entering the Deep Core. The Security Net was able to give Imperial star systems, and with some refinements, starships, in the Deep Core advanced warning of ships approaching through hyperspace. It was able to do this by using a system of non-mass transceivers, originally developed for the HoloNet to pass communications in specific frequencies, linked by a network of coordinated S-threads. The transceivers projected cross-channeled radiation which registered a hyperspace disturbance whenever a ship passed through it. The transceivers could detect these disturbances at cosmologically short distances and signal the gravity well projectors to drop incoming ships out of hyperspace. Gravity well projectors served as the backbone of the Security Net, creating artificial mass shadows to pull ships into realspace and prevent them from escaping. Sometimes gravity mines or Immobilizer 418 cruisers were used in place of gravity well projectors. Once a ship was pulled out of hyperspace, it had to present proper authorization or be fired upon by the surrounding Star Destroyers and support craft.

Security Net technology was, however, incredibly bulky and expensive. They could be built around systems, but practically they could only cover the most common hyperspace entry routes. Even then, the Security Net would still have many holes in it and could be subverted through through the use of experimental routes. Some transceivers were outfitted with hyperdrives and navigation computers, allowing them to randomly jump from point to point and cover more space. Ships unaware of the jump patterns of the transceivers often found it difficult to penetrate the Deep Core Security Zone undetected. Any system using the Security Net often rounded out its security with patrol vessels, asteroid mines, antimatter particles, and probe droids. By 137 ABY use of the Security Net had branched out to include the Core Worlds. In addition to gravity mines and Imperial Navy flotillas, the Net consisted of space stations placed along common hyperspace routes. Random inspections were performed on ships entering and leaving the Deep Core.

History
The Imperial Hyperspace Security Net was constructed in response to surprise ambushes on Imperial convoys and planets by Rebel Alliance ships. Alliance tacticians such as General Jan Dodonna and Admiral Ackbar perfected the use of hit and run skirmishes on Imperial ships through careful use of the hyperdrive, forcing the Empire to stop sending out unarmed transports. Full scale fleet dropping out of hyperspace could also devastate key locations of a planet before defenses could be brought online. The Security Net was installed throughout the Deep Core to give Imperial worlds advanced warning of approaching enemy fleets.

The technology used to create artificial gravity wells was developed after an accidental discovery by Imperial scientists in the Sedri system. The scientists discovered that it was possible to create an artificial gravity well, and though their mission there was foiled by agents of the Rebellion, the scientists learned much. After several months of research they were able to learn how to create an artificial gravity well on their own. Gravity well generators were soon installed on the new constructed Immobilizer 418 cruisers and, eventually, were used in the Security Net. The introduction of this technology caused the Rebels to become more cautious of attacking Imperial convoys and worlds. One Deep Core planet that utilized the Security Net was the Imperial fortress world Byss.

When the Trade Federation lost control of the Deep Core world Vulpter after the formation of the Empire, the shipping of foodstuffs to the planet was halted due to the Empire's anti-alien bias. Vulpter, cut-off from the rest of the galaxy after the formation of the Deep Core Security Zone, became a safe haven for Rebels who were able to bypass the Security Net. Though Galactic Emperor Palpatine wished conceal the Deep Core from the rest of the galaxy behind a veil of secrecy through its inaccessibility, he still needed supplies and troops brought into the Deep Core. Deep Core haulers, freighter captains hired by the Empire, carried out this task and were some the only individuals outside of the Empire given clearance to pass through the Security Net.

One of these Deep Core haulers was Salla Zend, a smuggler whose freighter, the Starlight Intruder, was licensed to transport goods beyond the Security Net. After Palpatine's resurrection in 10 ABY, attempted to smuggle her old flame Han Solo, along with his wife Leia Organa Solo, into Byss to rescue Organa Solo's brother, Luke Skywalker. En route to Byss the Intruder was being followed by the bounty hunter Boba Fett, who intended to collect a bounty on Solo. Byss Security was able to track the Intruder as it exited hyperspace and allowed it safe passage through Byss' planetary shield. Byss Security also noticed Fett's approach right behind the Intruder and was able to close the planetary shield on Fett's ship, Slave II, severely damaging it.

By 137 ABY, after the Dark Lord Darth Krayt usurped the Imperial throne for the One Sith, the Security Net had expanded to include the Core Worlds. With the addition of space stations along hyperspace routes, the Empire was able to perform random inspections on starships and stop attacks against protected planets.

Behind the scenes
The Imperial Hyperspace Security Net was first mentioned in Tom Veitch's endnotes from the second issue of the 1991–1992 comic book series Dark Empire. It first appeared in the fourth issue of Dark Empire as well as the comic's audio adaptation. The Security Net was first detailed in West End Games' Dark Empire Sourcebook and later in several Wizards of the Coast sources such as Byss and the Deep Core and the Legacy Era Campaign Guide.

Appearances

 * Dark Empire 4: Confrontation on the Smugglers' Moon
 * Dark Empire audio drama