30 mins of Laboratory Ambient - Amnesia: The Dark Descent (Dark Breathing/Ghost SFX)

Ambient soundscape from Amnesia: The Dark Descent. Deep down in the dark dankness of the Laboratory, you can hear Brennenburg breathe.
It knows you're here, and it's waiting with its jaw agape.
Amnesia: The Dark Descent --- Frictional Games

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Perfect for sleeping.