City of Crushed Stone

Near the location where Shūryō was initially sealed by the Senju and Uchiha clans, he raised an entire fortress with his Freeline Manipulation abilities. After defeating Anjin Uzumaki in a pitched battle, he took the unconscious man and placed him in a stasis chamber in a laboratory alongside other subjects. When Anjin was placed inside, a message etched itself into the plaque above his unit- "Anjin Uzumaki- Fūinjutsu." The next plaque over was visible, reading "Kírov-Senjutsu." There are many such units in the laboratory.