Disposal in deep underground geological formations is internationally recognized as the most viable option for the long-term management of high-level radioactive waste. In Belgium. the Boom clay formation is extensively studied in this context. in particular at the 225 m deep HADES Underground Research Facility in Mol. https://www.nacrack.com/hot-savings-HiBoost-Home-15K-Smart-Link-F20G-5S-IoT-limited-super/