Sodom and Gomorrah have survived for millennia as shorthand for divine punishment, but no confirmed archaeological trace of either city has ever surfaced. This Timeline film follows researcher Mike Sanders, who has spent years using sonar and diving equipment to examine formations on the bed of the Dead Sea that he argues are the remains of ancient structures. He dives into the water himself, inspecting shapes he believes are walls and buildings, and lays out a case that the cities were destroyed in a catastrophic event roughly 5,000 years ago before being swallowed by the sea's rising waters. The film sets his underwater survey against the biblical account of fire and brimstone and against mainstream scholarship, which mostly treats the story as parable rather than history. Interviews and location footage around the Dead Sea carry the argument, weighing Sanders' claims without fully resolving them, leaving the viewer to judge whether the sonar images amount to evidence or wishful pattern-matching.