Brother Eye on Earth-12 caused the Sentient Machine Crisis, so it was dismantled. With Old Batman retired as well, there were no intelligent programs left in the Hall of Justice, much less ubiquitous cameras.
Moreover, the material used to build the walls was special, rendering Superman's X-ray Vision useless here. That had been one of Old Batman's specific requirements back then.
"I'll get the door."
Big Dai rose to her feet, frowning as she prepared to see who was being so rude as to make such a disgraceful racket while they were receiving foreign guests.
Maybe it was Firestorm. Even at his age, that guy was still rash and careless.
"Wait. Don't go over there." Su Ming stood and stopped her, drawing his weapon at the same time. "There's no living person outside. Look."
He raised his hand and displayed the Black Lantern Ring, which was currently emitting a faint Black Light.
This was the automatic warning the Power Ring gave whenever Undead Creatures were active nearby, even if those undead posed no threat to the Ring Bearer. But the ring often behaved like a stupid program, following only its preset rules.
"You're a Power Ring bearer now?" Big Dai stopped in surprise. "The last time I helped you fight Barbatos, you were clearly still ordinary."
"I'm still an ordinary person now." Su Ming smiled and shook his head, twirling the Golden Scimitar as he walked toward the door. "I just know a little more than most."
The silver door reflected the metallic gleam unique to its material. This alloy had been brought back by Superman from Andromeda to build the Hall of Justice. It was lighter and prettier than Supermanium, and it could block X-ray Vision.
But it was clearly not sturdy enough. Under the violent impacts from outside,