In case of necessity, by retracing his steps a little way, and entering the passage of the Filles-du-Calvaire, on condition that he did not hesitate at the subterranean crossing of the Carrefour Boucherat, and by taking the corridor Saint-Louis, then the Saint-Gilles gut on the left, then turning to the right and avoiding the Saint-Sebastian gallery, he might have reached the Amelot sewer, and thence, provided that he did not go astray in the sort of F which lies under the Bastille, he might have attained the outlet on the Seine near the Arsenal. But in order to do this, he must have been thoroughly familiar with the enormous madrepore of the sewer in all its ramifications and in all its openings. Now, we must again insist that he knew nothing of that frightful drain which he was traversing; and had anyone asked him in what he was, he would have answered: “In the night.”

His instinct served him well. To descend was, in fact, possible safety.