The following account was recorded in the agent's log during your transmission: A fossilized triceratops, its frill shattered and half-buried, lies next to a mass of rusted medical equipment and surgical tools in the center of a massive, naturally occurring cavern. Uh, the air's heavy with the stench of decay and the walls are slick with what appears to be a slow-moving, iridescent slime. The only sound is a low, constant gurgling, like water flowing through a pipe, but the ground's bone-dry – I can see cracks in the stone. The sickly green sky's visible above, sunlight filtering through a jagged opening in the cavern roof, despite being what feels like miles underground.