The United States conducted several nuclear tests on the island of Hao in 1958, known as Operation Hardtack I. The tests had a devastating impact on the environment and the people of Tuamotu, as they were exposed to high levels of radiation. The tests caused widespread contamination of the soil and water, and many of the locals suffered from radiation sickness and other health problems. The impact of the nuclear tests on Tuamotu continues to be felt today, with some areas of the islands remaining uninhabitable due to radiation contamination.