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You follow Marcus and Erica as they navigate through the abandoned subterranean tunnels, and you can see there is another junction emerging ahead. In the faraway blackness of the tunnel you can hear a warbling crooning, ululating and alternating between soothing and discordant tones, as if it is singing a lullaby of consolation and suffering at the same time. You are unsure if the wailing voice is male or female, but it sounds unnatural, either in distress and in need of help, or perhaps a lure...
At the immediate junction ahead however, you discover you have finally arrived. There is something that resembles a fortified blast door, a completely solid reinforced metal and concrete wall - it looks like nothing can penetrate or breach it, not even a Sledgehammer. Strangely enough there is also an ordinary maintenance door built next to it, very slightly ajar and opened inwards, as if someone had forgotten to shut it properly or left it unlocked.