The next morning a heavy fog fell upon the sea, and the battle-ship and Crab C were completely shut out of sight of each other. Now the cannon of the Adamant were silent, for the only result of firing would be to indicate to the crab the location of the British ship. The smoke-signals of the towing crab could not be seen through the fog by her consorts, and she seemed to be incapable of making signals by sound. Therefore the commander of the Adamant thought it likely that until the fog rose the crab could not find his ship. What that other crab intended to do could be, of course, on board the Adamant, only a surmise; but it was believed that she would bring with her a torpedo to be exploded under the British ship. That one crab should tow her away from possible aid until another should bring a torpedo to fasten to her stern-post seemed a reasonable explanation of the action of the Syndicate's vessels. The officers of the Adamant little understood the resources and intentions of their opponents. Every vessel of the Syndicate carried a magnetic indicator, which was designed to prevent collisions with iron vessels. This little instrument was placed at night and during fogs at the bow of the vessel, and a delicate arm of steel, which ordinarily pointed upward at a considerable angle, fell into a horizontal position when any large body of iron approached within a quarter of a mile, and, so falling, rang a small bell. Its point then turned toward the mass of iron. Soon after the fog came on, one of these indicators, properly protected from the attraction of the metal about it, was put into position on Crab C. Before very long it indicated the proximity of the Adamant; and, guided by its steel point, the Crab moved quietly to the ironclad, attached itself to its stern-post, and allowed the happy crew of Crab K to depart coastward. When the fog rose the glasses of the Adamant showed the approach of no crab, but it was observed, in looking over the stern, that the beggarly devil-fish which had the ship in tow appeared to have made some change in its back. In the afternoon of that day a truce boat was sent from the repeller to the Adamant. It was allowed to come alongside; but when the British captain found that the Syndicate merely renewed its demand for his surrender, he waxed fiercely angry, and sent the boat back with the word that no further message need be sent to him unless it should be one complying with the conditions he had offered. The Syndicate now gave up the task of inducing the captain of the Adamant to surrender. Crab C was commanded to continue towing the great ship southward, and to keep her well away from the coast, in order to avoid danger to seaport towns and coasting vessels, while the repeller steamed away.