"Everything echoes several times over in here," Matt agrees. "But it's. Oddly silent outside." He doesn't know what silent is. Hasn't known it since his enhanced hearing developed, apart from that time Frank shot him in the head. It's just vast and empty and silent outside. He's uncomfortable about it.

"There's more than one?" he asks, sounding genuinely surprised. "I just. Sort of assumed people would have tried getting into everywhere by now."