Deep borehole disposal is a viable, cost-effective solution for all of the intermediate and high-level long-lived radioactive waste that is being temporarily stored by five European countries, according to a feasibility study by Deep Isolation. The study was commissioned by Norwegian Nuclear Decommissioning on behalf of the European Repository Development Organisation, a multinational group established in 2021 to address the challenges of safely managing long-lived radioactive wastes either separately or in one combined mined repository.