Atlantic Ridge

Vast submarine mountain range along the Atlantic Ocean floor, the Atlantic Ridge lies near the point where the lost city of Atlantis pushes upward from the depths. Zaroff names it during his corridor interrogation, alerting the Doctor to their true submerged surroundings. This geological marker evokes immense tectonic pressure and rising peril, as the city's resurgence threatens to shatter the ocean's hold, sharpening the Doctor's realization amid echoing stone walls and urgent voices.