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Two liquid hydrogen spheres, located to the southeast of the S-IC Test Stand.

These spheres were used in the 1970s to support tanking tests of the Shuttle external tank. They are in the same location as the liquid oxygen storage spheres from the Saturn era; I am uncertain as to whether the existing LOX spheres could be used for LH₂ or whether it was necessary to install new tanks capable of operating at the colder LH₂ temperatures at this location.