It was down this shaft they took him, in this “sort of balloon” he speaks of, at first into an inky blackness and then into a region of continually increasing phosphorescence. Cavor’s despatches show him to be curiously regardless of detail for a scientific man, but we gather that this light was due to the streams and cascades of water⁠—“no doubt containing some phosphorescent organism”⁠—that flowed ever more abundantly downward towards the Central Sea. And as he descended, he says, “The Selenites also became luminous.” And at last far below him he saw, as it were, a lake of heatless fire, the waters of the Central Sea, glowing and eddying in strange perturbation, “like luminous blue milk that is just on the boil.”