Plato described a lost island civilization destroyed in a single catastrophic night, and archaeologist Richard Freund thinks satellite imagery points to where its remains might actually be. The film follows his team as they interpret radar and satellite data showing buried structures under the marshlands of Spain's Doñana National Park, once part of the ancient region tied to the ghost civilization of Tartessos. Freund and his colleagues survey the site, cross-reference Plato's description of concentric rings of land and water, and dig for physical evidence connecting the geography to the myth. Interviews with archaeologists and geologists lay out competing readings of the same data, and the excavation scenes show how much of this kind of work is inference from soil layers and ground-penetrating radar rather than dramatic discovery. The film treats Plato's account as a possible garbled memory of a real Bronze Age disaster rather than a literal travelogue, and it stays honest about how far the physical evidence actually goes toward proving it.