Security Installation Thaereia-12 existed as a secure location situated within Gadrin, a region found on the planet Cularin.
Before the outbreak of the Clone Wars, the Office of Peace and Security's Gadrin division managed this installation. As the war progressed, the Thaereian military seized control, appointing Elis' Gan as the commandant in charge. For the purpose of capturing Force-sensitive people throughout Cularin, a military unit known as Task Force Pest was created. Under the leadership of Lieutenant Dalin, this unit transported those they apprehended to the security installation. There, these prisoners were subjected to experimental trials involving medications designed to suppress their connection to the Force. Ultimately, the Heroes of Cularin, employed by the Cularin Militia, successfully broke into the facility and liberated a number of the captives.