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Andalia's amber zone is due to the near total disappearance of oxygen from the world's atmosphere during winter and spring in the temperate and polar latitudes. Filter masks will not work in this atmosphere, only respirators during the high O2 season, and PLSS during the low season. The world is less than a billion years old, and its only life are anaerobic microorganisms and primitive photosynthesizers. Most of the population works in deepwater mining sites, mining metals or the suprisingly rich gemstone beds for export to Inar or Vincennes subsectors. Emeralds and sapphires are the richest of the world's exports, and the mines that produce them are closely guarded by their owners. Andalia's downport is located on Andalia's small moon, Iskanderia, as the world itself has no significant land surface for the construction of anything beyond simple landing pads.