The following account was recorded in the agent's log during your transmission: Cascading sheets of crystalline water plunge down a seemingly endless, stepped waterfall, into an inky black abyss – the sound like a never-ending crash of glass echoing off ancient, cyclopean walls. Uh, a low-frequency hum, like the reverberation of a thousand chanting voices, resonates through the damp air – air thick with the scent of petrichor and ozone. Fungal growths that appear to be faintly pulsing bioluminescent mushrooms somehow cling to, and even seemingly 'grow into' the very fabric of the stone itself. Shadows move against the stone walls like living darkness.