Mount Tantiss

Mount Tantiss was a storehouse built by Galactic Emperor Palpatine in 0 BBY. It contained his clones, and cloning chambers. It was a vast complex and the New Republic attempted many times to destroy it, which failed. It was used by Admiral Parck to make an army of stormtroopers and other stormtrooper variants, and he added it to the regular stormtrooper army.