The following account was recorded in the agent's log during your transmission: Uh, water's pouring down a series of intricately carved, black stone steps, like, into a massive underground reservoir that seems to be filled with some kind of thick, viscous liquid that's way denser than water. The air's super humid and it smells like wet earth and mold, and there's this really low rumble, like thunder, but it's constant and doesn't seem to be changing pitch. The sky above the reservoir's got this sickly yellowish tint, and a vintage biplane's somehow half-submerged in the liquid, its propellers still spinning really slowly, despite there being no visible engine or fuel source.