The following account was recorded in the agent's log during your transmission: Uh, sunlight filters through the transparent ice walls of this hollow, crystalline cave system, casting an otherworldly glow on the dark, liquid rock that seems to be seeping from the crystal facets. The air's crisp and cold, with a metallic tang, like... ozone's absent cousin or something. Gravity appears to be subtly warped in here, with shards of crystal detaching from the walls to hover within a precisely-defined, cubic volume, never breaching its invisible boundaries. A slow, periodic tremor vibrates the air, like the hum of some impossibly distant engine.