The morning of February 13, 1960, began in stillness in Reggane, 900 miles southwest of Algiers, deep in the Algerian Sahara. Windless, indifferent, almost serene, the desert stretched flat and endless around the site. Then, at 7:04 a.m., the sky split open. A blinding flash tore through the horizon—a fireball swelling hundreds of meters wide, followed by a thunderclap that swallowed the desert’s silence. A shockwave raced outward, rippling across sand, stone, and human bodies. 

In a matter of seconds, the Sahara—once a colonial outpost—was transformed into a nuclear frontier. France had just detonated its first atomic bomb, known as Gerboise Bleue (Blue Jerboa). The blast, equivalent to 70 kilotons of TNT, was far more powerful than the bomb dropped on Hiroshima more than a decade before. A towering column of radioactive dust surged into the atmosphere, then drifted across North Africa and beyond, carried by winds that recognized no colonial borders.

For France, that morning marked its triumphant entry into the nuclear club. For the people of Reggane, it marked the start of a new, irreversible reality.

Ami Mohamed was working near the site that morning. He was hauling stones for the French military. He had not been told what was coming, nor given protective gear.  When the flash erupted, he felt the ground shudder beneath his feet as the air slammed into his body like a wall. He would later recall watching the towering cloud rise—swallowing the sky—without realizing he was standing at the edge of an atomic experiment. He was not alone. 

Thousands of civilians in Reggane and the surrounding areas were caught in France’s nuclear experiment. Entire communities—an estimated 42,000 people—were left directly in the path of radioactive fallout. Between 1960 and 1966, France conducted at least 17 nuclear tests in the Algerian desert—four atmospheric explosions near Reggane, followed by thirteen underground tests in the Hoggar region. These detonations, along with a series of additional experiments linked to weapons development and waste management, left a deep and lasting imprint on the Sahara.

More than scientific experiments or Cold War posturing, France’s nuclear tests in Algeria were a form of colonial risk externalization: the deliberate transfer of existential danger onto a colonized land and its people. The colonial administration exported the catastrophic potential of its nuclear program far from its own population, offloading the risks of fallout and long-term contamination onto a colony deemed expendable.

The consequences—cancers, birth defects, poisoned ecosystems—became a lasting toxic legacy, persisting long after colonial rule had ended. The tests embodied the core logic of the colonial empire: land and lives were appropriated to secure power. France accrued prestige, deterrence, and geopolitical leverage, while the risks—contamination, illness, and displacement—were borne by its colonial subjects. Algerian territory, and later French Polynesia, became the proving ground.

“I had prayed the dawn prayer and remained seated when the bomb exploded and lit up the entire room,” recalls an elderly survivor, his testimony preserved by the International Committee of the Red Cross. “People began praying and supplicating to God, thinking it was the end of the world. Then came a tempestuous wind that killed people and livestock. I lost 25 camels that year.”

Decades after the last test conducted in 1966, the environmental damage remains deeply embedded in the landscape. Radioactive debris was left scattered across the desert, as French authorities buried contaminated metal, equipment, and vehicles used during the tests. Contaminated materials—including metal and sand—were reportedly reused in homes, fences, and tools. Contamination of soil and water forced herders to avoid ancestral grazing routes. Radioactive debris contaminated grazing lands and water sources. Livestock died after exposure, and herders were forced to avoid or abandon traditional routes, disrupting nomadic patterns and leading some settlements to be deserted.

In a landscape where mobility is survival, contamination altered centuries-old patterns of life, quietly reshaping desert ecologies and human geographies alike.

The ecological consequences were not confined to the blast sites. The atmospheric detonations fused desert sand into radioactive glass and spread toxic contamination across wide areas of the Sahara. Subsequent underground tests fractured granite mountains, releasing contaminated rubble and radioactive gases. Radioactive material seeped into soil layers, contaminating desert wells and aquifers that sustained local populations and oases. In an arid environment where water sources are scarce, the contamination of wells reshaped patterns of settlement, migration, and survival.