The following account was recorded in the agent's log during your transmission: A slow trickle of water pools at the edge of a massive, hollowed-out opal deposit, its walls radiating an iridescent sheen in the flicker-free, ethereal light that permeates this subterranean space. The air is stale and humid, with the scent of damp earth and something metallic, but the hundreds of iridescent, crystalline shards that jut from the walls seem to be slowly absorbing the moisture, defying basic chemistry. Outside, the sound of dripping water echoes softly, but here, it's almost completely silent, like time has been arrested. Glacial melt appears to be seeping upwards from the base of the deposit, solidifying into crystalline facets that somehow echo an ancient Sumerian cuneiform pattern.