A2 service tunnel existed within the Colossus supertanker fuel depot. While the station was in flight escaping the First Order, Neeku Vozo and Nenavakasa Nalor performed maintenance inside this tunnel. Because Nalor had developed affection for Vozo, she almost confessed to him there that she was a saboteur employed by the First Order, but she changed her mind. Following the discovery of Nalor's sabotage and her subsequent escape from the Colossus, Vozo dispatched Kazuda Xiono to the service tunnel to reverse some of Nalor's "repairs" to enable the station's movement.