This Underground Facility Must Survive for 100,000 Years #shorts #documentary

Where do you put nuclear waste when it must remain isolated for hundreds of thousands of years? Finland believes the answer lies more than 400 meters underground. At Olkiluoto on Finland's western coast, a massive underground facility called ONKALO has been built deep inside ancient bedrock to provide long-term final disposal for spent nuclear fuel. Finland began investigating permanent disposal solutions in the 1970s. In 1983, the Finnish government established guidelines and target schedules for nuclear waste management. After years of geological research and site investigations, Olkiluoto was selected for the final disposal project. Then, in 2004, excavation began on ONKALO. Tunnel by tunnel, engineers descended hundreds of meters into Finnish bedrock to study whether the rock could safely host spent nuclear fuel for an almost unimaginable period of time. The system relies on multiple protective barriers. Spent nuclear fuel is sealed inside specially designed disposal canisters. The canisters are placed roughly 430 meters underground inside vertical deposition holes. Bentonite clay surrounds the canisters. The tunnels are then backfilled and eventually sealed. Fuel. Metal canister. Bentonite clay. Ancient bedrock. Each barrier is designed to contribute to long-term isolation. When fully developed, ONKALO is designed to accommodate approximately 6,500 tonnes of spent nuclear fuel in about 3,250 disposal canisters. Then came another historic milestone. On August 26, 2026, more than 400 meters underground, a massive 78-ton deposition-hole boring machine began drilling the first hole intended for actual final disposal. The finished hole is designed to be approximately 8.4 meters deep and 1.75 meters in diameter. But spent nuclear fuel was not immediately placed inside. The holes must first meet strict engineering and measurement requirements. After more than four decades of research, testing, excavation and engineering, Finland is approaching the implementation of one of the world's most ambitious nuclear waste projects. In this video: • What happens to spent nuclear fuel • Why nuclear waste is difficult to dispose of • Finland's nuclear waste strategy • The history of ONKALO • Why Olkiluoto was selected • How deep ONKALO is • How nuclear waste canisters work • Copper, iron and bentonite barriers • Deep geological disposal • How spent nuclear fuel is stored underground • The 2026 deposition-hole milestone • The 78-ton boring machine • Why the repository must remain safe for extremely long periods • The future of nuclear waste disposal ONKALO isn't simply an underground storage room. It is an engineering system designed around an extraordinary challenge: How do you protect people far into the future from waste created today? #NuclearWaste #ONKALO #NuclearEnergy #NuclearPower #Finland #Engineering #Olkiluoto #NuclearTechnology #Science #Documentary #SpentNuclearFuel