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On his sixteenth birthday, Rex Himmel is recruited by the military and learns that he’s special––but no one will tell him how.
Rex and his new unit are trained to climb down the six-mile tube to investigate Cthonia.
Rex’s unit climbs down the tube, but it looks like there are more people below than anyone thought, and Ætheria might be in danger.
Eleven days before the explosion in Ætheria, a team from Cthonia sets off for the tube to the sky in search of water.
The first team of spotters ascends the ladder. A few days later, the records of their communications plummet back down.