Study reveals ecosystem impacts of radioactive waste dumped in Atlantic from 1950 to 1990

On July 2, 2026, a new study documented the interactions between ecosystems and radioactive waste dumped in the North-East Atlantic from 1950 to 1990. Led by the CNRS, this research follows an initial mapping mission in June 2025, aimed at understanding the ecological effects of over 200,000 barrels of radioactive waste.

Details of the Recent Mission

The Nodssum project set sail again on May 27, 2026, to explore areas identified in the previous mission. This second phase involved about 30 scientists aboard the vessel Pourquoi Pas?, utilizing the manned submersible Nautile for deep-sea exploration.

During the expedition from May 27 to June 28, 2026, the Nautile conducted 20 dives to depths exceeding 4,700 meters (approximately 15,420 feet). The team observed several barrels, noting significant degradation and leakage of materials into the surrounding seabed.

Findings on Radioactive Waste

The observations revealed alarming levels of deterioration among the barrels. Scientists confirmed the presence of radionuclides at activity levels higher than anticipated for the region. Specific materials used in encapsulating the waste, such as resin, bitumen, and cement, were identified.

Measurements taken during the mission indicated that the activity levels of radionuclides remain low enough to handle samples without major radiation protection constraints. Additionally, samples of water, sediments, and living organisms were collected to study the dispersion and transfer mechanisms of radioactivity.

Impact on Marine Ecosystems

The research team also documented the biodiversity present near the barrels and in surrounding habitats. This mapping may assist in identifying the origins of certain barrels.

As laboratory analyses continue, researchers aim to better understand how radionuclides interact with deep-sea ecosystems and the processes governing their transport in the ocean. The findings from this research are expected to provide crucial insights into marine water quality and waste treatment.