Ariane 5 helium tank. Technician assembling a helium tank for the Ariane 5 rocket. This spherical tank is covered with black carbon fibre. It will hold 300 litres of pressurised liquid helium. The tanks supply pressure to the propellant tanks and compensate for the pressure decrease as the propellant tanks empty during lift off. Photographed at the Cryospace factory, Les Mureaux, France.
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