View full lesson: http://ed.ted.com/lessons/real-life-sunken-cities-peter-campbell

Though people are most familiar with Plato’s fictional Atlantis, many real underwater cities actually exist. Peter Campbell explains how sunken cities are studied by scientists to help us understand the lives of our ancestors, the dynamic nature of our planet, and the impact of each on the other.

Lesson by Peter Campbell, animation by TED-Ed.