The region of the Marinoids was a stretch of water bounded by great rocky cliffs on all sides. It was subterranean water—by which I mean that by ascending in it one came at last to a rocky ceiling. We were, at Rax, near the center of this subterranean sea. What was its extent, I cannot say. All measurements, all standards of comparison, were lost to me. In depth—at Rax—it might have been two thousand feet or more from the sea-floor to the ceiling above, which is to say some two or three times the depth of the city itself.
How many entrances there were from the outside world, I do not know. Through one of them Nona and I had come when Caan and his party first encountered us. To the Marinoids, who were not explorers, the idea of a surface to water was inexplicable. They could not conceive o
