Rama revealed

Joined by their children and other rebels from the Earth sector, Nicole and Richard enter New York's labyrinthine underground aboard a ghostly subway hoping to find the ship's secret inner workings. What they find instead is the emerald-domed lair of the technologically advanced species that rules this fabulous subraman world: the octospiders. These arachnidlike creatures are luring Nicole and the rebels into their domain, but the Earth group is divided as to whether the octospiders are allies or enemies - and anxious to discover the fate of two of their group abducted by the enigmatic aliens.