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Hydrogen, either natural or synthetized, will be a part of the energy mix in the future and underground storage in salt caverns appears as a suitable option for hydrogen resources management. A good understanding of the internal structure of salt bodies is needed to safely develop and monitor these caverns. But seismic imaging inside salt is often of poor quality and our understanding of intra-diapiric structure partly lies on scarce data derived from mines shafts. The Deep in Salt project, based on the Zechstein case-study, aims at providing new insights into the understanding of intra-salt deformation through a multidisciplinary approach involving seismic and well interpretation, analogue experiments, numerical simulations and geophysics. The main objectives are to give guidelines for the apprehension and interpretation of the internal structure of diapirs and to find the fit-for-purpose seismic acquisition designs and data processing to improve imaging inside these diapirs.