In the 11th century the Fatimid caliph al-Hakim ordered the polymath Ibn al-Haytham to dam the Nile. He decided it was impossible, faked madness to escape the caliph’s anger, and spent about a decade under house arrest writing his Book of Optics. Nine centuries later the dream returned as a Cold War prize. After the 1952 revolution, Gamal Abdel Nasser rejected British plans to store the Nile upstream in Sudan and Ethiopia and backed a single dam at Aswan, first proposed by engineer Adrian Daninos. The United States and Britain offered $270 million, then John Foster Dulles pulled the funding in July 1956 after Nasser bought arms through Czechoslovakia and recognized the People’s Republic of China. Nasser nationalized the Suez Canal, and the Soviet Union committed $1.12 billion.

From 1960 to 1970, Soviet chief designer Nikolai Malyshev and Egyptian contractor Osman Ahmed Osman led 25,000 workers in building an embankment dam 3,830 meters long and 111 meters high, creating Lake Nasser, 500 kilometers long. Its 12 Francis turbines produced 2.1 gigawatts, about half of Egypt’s electricity, and wheat yields tripled. Then the costs arrived: the trapped silt, the displacement of 100,000 to 120,000 Nubians, the UNESCO race to move 22 monuments including Abu Simbel, and a 2024 study warning that a breach would bury Egypt’s farmland under rigid mud.

• The Mediterranean sardine catch fell from 18,000 tons a year to 460 tons by 1968 once the silt stopped reaching the sea
• Brickmakers who lost the flood mud began stripping topsoil off the very farmland the dam was built to protect
• How capillary action pulled salt to the surface and forced a $3.1 billion drainage network over three decades
• Why predictions of a schistosomiasis explosion proved wrong, with rates dropping after construction
• The Temple of Dendur now standing in the Metropolitan Museum of Art, and the fortress of Buhen lost under Lake Nasser