Should a Sewer-Hunter find himself sinking in a quag-mire, he immediately throws out the long pole, armed with the hoe, and seizes the first object in the sewer, to hold himself up. In some places, had the searcher no pole, he would sink, and the more he tried to extricate his person, the deeper he would imbed his body. Use is made of the pole to rake the mud for iron, copper, or bones, and occasionally the rake turns up the remains of a human being, who may have perished in those fetid cells. Great skill is necessary in the hunter, to know always when the tide leaves and comes, so as to enable him to find articles at certain points. The brick work in many parts is rotten, especially in old sewers, and there is great risk in traversing the channels, as sometimes, when the sewers are being flooded from the dams erected at stated intervals, the passage is flooded to a height of three feet, very suddenly, and if the Sewer-Hunter be not notified the first intimation of his danger is given by a thundering, rushing sound, and before he can escape the waters are upon him, and he is enveloped by them or hurled down with tremendous force, and swept along for miles in darkness, and filth, and despair, cut off from all human aid, no ear to hear his shouts, and no hand stretched forth to save. In some places where the arches are unsafe, he will not dare to touch any part of the roof of the sewers, or the sides, fearing that he may be buried beneath the ruins. The main sewers are generally five feet high from floor to ceiling, but the branch sewers are much lower, and it is necessary to crawl on hands and knees to proceed. In the main sewers, there are niches built in the brick walls of some depth, with a raised platform, and the hunters always step into one of those when the sewers are being flooded, to clean them. [Sidenote: AN UNLAWFUL BUSINESS.] Rats, unless in great numbers, will not attack a man if he passes them quietly, but if driven to a corner they will fly at the intruder's face and legs in hundreds. A bite from one of these rats will swell a man's face or arms to an enormous size. The men who are employed as "flushers" to clean the sewers wear leather boots, the legs of which come up to the hips, and of thick leather, and when the rats make an attack on these men, they always flash their lanterns, which are fastened to leather belts around their waists, and this frightens the vermin away, as they are not accustomed to light, and will flee from it if not molested. The big leather boots of the "flushers" cannot be bitten through by the rats.