How to store volatile nuclear waste? Researchers from the Planetology and Geosciences Laboratory (LPG – Nantes University – CNRS – University of Angers), the Nantes Jean Rouxel Materials Institute (IMN – Nantes University – CNRS) and the SUBAtomic Physics and Associated TECHnologies Laboratory ( Subatech – CNRS – Nantes University – IMT Atlantique) have combined their skills to try to answer this question as part of a Pari Scientifique (CIPress) project funded by the Pays de la Loire Region.