[en] Injecting hydrogen in the natural gas grid poses a number of problems. Does hydrogen hold the key to the great energy transition to come? France and other countries believe this to be the case, and have chosen to invest heavily in the sector. Such spending will be needed to solve the many issues raised by this energy carrier. One such issue is containers, since hydrogen tends to damage metallic materials. At Mines Saint-etienne, Frederic Christien and his teams are trying to answer these questions.