If so, he would probably still recover the body, for the current could hardly touch it at the depth, which was already great, and seemed sensibly to increase. Benito then resolved to pursue his investigations on the side where he had begun to probe the vegetation. This was why he continued to advance in that direction, and the raft had to follow him during a quarter of an hour, as had been previously arranged.
The quarter of an hour had elapsed, and Benito had found nothing. He felt the need of ascending to the surface, so as to once more experience those physiological conditions in which he could recoup his strength. In certain spots, where the depth of the river necessitated it, he had had to descend about thirty feet. He had thus to support a pressure almost equal to an atmosphere, with the result of the physical fatigue and mental agitation which attack those who are not used to this kind of work. Benito then pulled the communication cord, and the men on the raft commenced to haul him in, but they worked slowly, taking a minute to draw him up two or three feet so as not to produce in his internal organs the dreadful effects of decompression.
As soon as the young man had set foot on the raft the metallic sphere of the diving-dress was raised, and he took a long breath and sat down to rest.
The pirogues immediately rowed alongside. Manoel, Fragoso, and Araujo came close to him, waiting for him to speak.
"Well?" asked Manoel.
"Still nothing! Nothing!"
"Have you not seen a trace?"
"Shall I go down now?"
"No, Manoel," answered Benito; "I have begun; I know where to go. Let me do it!"
Benito then explained to the pilot that his intention was to visit the lower part of the bank up to the Bar of Frias, for there the slope had perhaps stopped the corpse, if, floating between the two streams, it had in the least degree been affected by the current. But first he wanted to skirt the bank and carefully explore a sort of hole formed in the slope of the bed, to the bottom of which the poles had evidently not been able to penetrate. Araujo approved of this plan, and made the necessary preparations.
Manoel gave Benito a little advice. "As you want to pursue your search on that side," he said, "the raft will have to go over there obliquely; but mind what you are doing, Benito. That is much deeper than where you have been yet; it may be fifty or sixty feet, and you will have to support a pressure of quite two atmospheres. Only venture with extreme caution, or you may lose your presence of mind, or no longer know where you are or what to do. If your head feels as if in a vice, and your ears tingle, do not hesitate to give us the signal, and we will at once haul you up. You can then begin again if you like, as you will have got accustomed to move about in the deeper parts of the river."
Benito promised to attend to these hints, of which he recognized the importance. He was particularly struck with the fact that his presence of mind might abandon him at the very moment he wanted it most.
Benito shook hands with Manoel; the sphere of the diving-dress was again screwed to his neck, the pump began to work, and the diver once more disappeared beneath the stream.
The raft was then taken about forty feet along the left bank, but as it moved toward the center of the river the current increased in strength, the ubas were moored, and the rowers kept it from drifting, so as only to allow it to advance with extreme slowness.
Benito descended very gently, and again found himself on the firm sand. When his heels touched the ground it could be seen, by the length of the haulage cord, that he was at a depth of some sixty-five or seventy feet. He was therefore in a considerable hole, excavated far below the ordinary level.
The liquid medium was more obscure, but the limpidity of these transparent waters still allowed the light to penetrate sufficiently for Benito to distinguish the objects scattered on the bed of the river, and to approach them with some safety.