The man glanced at his companions, but seeing no help forthcoming from them, he began sulkily to take off the copper gorget and the india-rubber garments, with the heavy leaden-soled boots, which, with the help of the old sailor, Dutch slipped on with the ease of one accustomed to handle such articles; then fitting on the leaden weights-- the chest and back piece--he took up the helmet, saw that the tube from the back was properly adjusted and connected with the air-pump, which he examined, and then turned to Captain Studwick-- "You'll see that no one touches the tube, Mr Studwick," he said, in a low tone. "One of those fellows might feel disposed to tamper with it." The captain nodded, and Dutch then lifted on the helmet, the rim of which fitted exactly to the gorget, had the screws tightened, and then, with the old sailor and the captain himself seeing that the tube and signalling cords were all right, the pump began to work, and Dutch walked heavily to the side, took hold of the rungs of the ladder, and began to descend. In a few moments his head had disappeared, and his blurred figure could be made out going down into the darkness, while a constant stream of exhausted air which escaped from the helmet-valve kept rising in great bubbles. The pump clanked as its pistons worked up and down, and the sailors and divers--the former eagerly and the latter in a sulky fashion--approached the side and looked over. Captain Studwick himself held the signal-line, and answered the calls made upon him for more or less air by communicating with the men at the pump; and so the minutes passed, during which time, by the necessity for lengthening out the tube and cord, it was evident that Dutch was going over the submerged vessel in different directions. All had gone so well that the captain had relaxed somewhat in his watchfulness, when he was brought back to attention by a violent jerking of the cord. "More air!" he shouted--"quick!" just as there was a yell, a scuffle, and the man Tolly struggled into the middle of the deck, wrestling hard with a black sailor, who backed away from him, and then, running forward like a ram, struck his adversary in the chest and sent him rolling over into the scuppers. By this time the signalling had ceased, and Dutch was evidently moving about at his ease. "What was that?" said Captain Studwick, sternly, as the man Tolly got up and made savagely at the black, but was restrained by the strong arm of the old sailor, Oakum. Tolly and the black both spoke excitedly together, and not a word was to be understood. "Here you, Mr Tolly, what is it?" cried the captain. "Hold your tongue, 'Pollo." "I bash him head, sah. I--" "Hold your tongue, sir," said the captain. "What was it?" "I happened to look round, sir, and found this stupid nigger standing on the tube, and when I dragged him off he struck me." "Who you call nigger, you ugly, white, fat-head tief?" shouted the black, savagely. "I bash your ugly head."