India, June 4 -- For decades, countries that rely on nuclear power have faced one major challenge: what to do with highly radioactive waste that remains dangerous for thousands of years.

Finland now believes it has found an answer.

Deep beneath a forest in southwestern Finland, engineers have built a vast underground repository designed to safely isolate spent nuclear fuel from people and the environment for up to 100,000 years. The facility, known as Onkalo, is expected to become the world's first permanent disposal site for high-level nuclear waste once it receives final regulatory approval.

Why Nuclear Waste Remains a Global Challenge?

Nuclear power plants generate electricity without producing large amounts of greenhouse gases, bu...