And they did go quick. They fitted up the Susquehanna for her new destination. Her powerful machinery was brought to bear upon the hauling-chains. The aluminium projectile only weighed 19,250 lbs., a weight very inferior to that of the transatlantic cable which had been drawn up under similar conditions. The only difficulty was in fishing-up a cylindro-conical projectile, the walls of which were so smooth as to offer no hold for the hooks. On that account Engineer Murchison hastened to San Francisco, and had some enormous grappling-irons fixed on an automatic system, which would never let the projectile go if it once succeeded in seizing it in its powerful claws. Diving-dresses were also prepared, which through this impervious covering allowed the divers to observe the bottom of the sea. He also had put on board an apparatus of compressed air very cleverly designed. There were perfect chambers pierced with scuttles, which, with water let into certain compartments, could draw it down into great depths. These apparatuses were at San Francisco, where they had been used in the construction of a submarine breakwater; and very fortunately it was so, for there was no time to construct any. But in spite of the perfection of the machinery, in spite of the ingenuity of the savants entrusted with the use of them, the success of the operation was far from being certain. How great were the chances against them, the projectile being 20,000 feet under the water! And if even it was brought to the surface, how would the travellers have borne the terrible shock which 20,000 feet of water had perhaps not sufficiently broken? At any rate they must act quickly. J. T. Maston hurried the workmen day and night. He was ready to don the diving-dress himself, or try the air apparatus, in order to reconnoitre the situation of his courageous friends. But in spite of all diligence displayed in preparing the different engines, in spite of the considerable sum placed at the disposal of the Gun Club by the Government of the Union, five long days (five centuries!) elapsed before the preparations were complete. During this time public opinion was excited to the highest pitch. Telegrams were exchanged incessantly throughout the entire world by means of wires and electric cables. The saving of Barbicane, Nicholl, and Michel Ardan was an international affair. Every one who had subscribed to the Gun Club was directly interested in the welfare of the travellers.