An underground jail, initially a storm bunker for the city council, was utilized by Nihil pirates as a prison when they occupied the Outer Rim world of Valo. This occurred in 229 BBY.
This prison is featured in Escape from Valo, a young adult book from 2024 penned by Daniel José Older together with Alyssa Wong. It is part of Phase III of the Star Wars: The High Republic initiative.