The Dizonite massacre, an event that occurred around 6 BBY, transpired on the Outer Rim Territories moon known as Dizon Fray. This atrocity was triggered by the resistance of the native sentient Dizonites against the Galactic Empire's intentions to construct a refueling station on their homeworld.
In the early years of the Galactic Empire's reign, the Imperial Department of Military Research's Project Stardust put in place numerous facilities and outposts to help with the Death Star's construction. The IDMR eventually identified the moon of Dizon Fray within the Dizon system as an ideal location for a transport hub linking the Imperial border regions and the Death Star construction site. Furthermore, Imperial scouts conducting geological surveys of the moon's ocean floors discovered significant deposits of raw materials that could be synthesized into fuel both in the seabed and along the shorelines. This discovery resulted in the decision to build a refueling station on the moon, which would be almost self-sufficient because of its natural resources.
The sentient species indigenous to the moon, the Dizonites, reacted with hostility to the Empire's intrusion, actively sabotaging their construction projects. Beyond their opposition to being subjugated, New Republic historian Beaumont Kin proposed that the Dizonites were also offended by the Empire's destruction of structures integral to their religion, an incident only vaguely mentioned in Imperial records.
Regardless of the precise reasons, by 6 BBY, the commanders overseeing Dizon Fray received authorization to eradicate the Dizonite species. This was achieved by deploying modified Arc Pulse Generators from Gozanti-class cruisers into the moon's oceans and activating them. The high salinity of Dizon Fray's ocean water made it highly conductive, and the electrical charge propagated through the currents, gradually electrocuting most of the Dizonite population to death over several hours. As they died, the Dizonites emitted agonizing "songs," which Imperial forces recorded as proof of the mission's success. The event was devastating, leaving many Imperials in a catatonic state.
The recordings of the Dizonites' death cries were analyzed by Imperial Security Bureau interrogation specialists, including Doctor Gorst, for potential use in advanced interrogation techniques. Gorst and his team determined that the cries of Dizonite children were particularly effective and modified these recordings. They successfully used these modified recordings to elicit confessions from Imperial prisoners, including Bix Caleen.
Historian Beaumont Kin referenced and analyzed the Dizonite massacre in his book, The Rise and Fall of the Galactic Empire, citing it as an example of Imperial genocide and "the deliberate and uncaring nature of Imperial violence against their adversaries."