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All Ariane 5 rockets feature a spherical cryogenic storage tank called the LHESS, which supplies the helium circuit that pressurizes lower-stage liquid oxygen tank. We designed this unique supercritical helium cryostat to meet the launch vehicles' need for compactness and efficiency, as well as the mechanical strength imposed by take-off. The most complex technical challenges are this tank's perfect leak-tightness and exemplary thermal insulation. And these are challenges we have met!