Starting at the hot end, Kath Two walked through a Southeast Asian jungle so humid that moisture condensed on her face before she could even begin to perspire. No sky was visible beneath its triple canopy, but when she stepped through the next airlock into Chihuahuan desert, she was treated to a direct view up through its ceiling into space, and blasted with sunlight bounced in by a robotic mirror mounted outside. Hanging up there in the center of the Great Chain was a little habitat called Surtsey. For during Kath Two’s stay in Quarantine, the Eye had moved on from Akureyri, passed the even larger habitat of Sean Probst at twenty degrees west, and was now entering a sort of boundary zone on the edge of the Cape Verde boneyard. She knew nothing of Surtsey, but it looked like a placeholder habitat, a sort of construction shed that would be used as the basis for something planned a minute or two west of here. Her skin and hair dried out instantly under the sun, and by the time she reached the end of the block, she almost wished she’d stayed below in the tunnels, where she needn’t have worried about cactus spines and rattlesnakes.