Lethal Liquid Pool

The Doctor dips an item into this still pool of liquid in the dim caves, watching it dissolve instantly to confirm its deadliness—a clear Silurian defense barrier. Liz and the Doctor skirt the hazard, clinging to Quinn’s mapped safe route amid slick stone and echoing tension. The obstacle sharpens their caution, underscoring alien ingenuity and the thin line between discovery and doom as they press toward the hidden base.