But the Dipsey had sailed in such devious ways and in so many directions that she had laid a great deal of the cable upon the bottom of the polar sea, and it would be difficult, or perhaps impossible, to sail back over her previous tracks and take it up again; and there was not enough of it left for her to proceed southward very far and still keep up her telegraphic communication. Consequently it was considered best, upon starting southward, that they should cut loose from all connection with their friends and the rest of the world. They would have to do this anyway in a short time. If they left the end of the wire in some suitable position on the coast of the polar sea, it might prove of subsequent advantage to science, whereas if they cut loose when they were submerged in the ocean, this cable from Cape Tariff to the pole must always be absolutely valueless. It was therefore determined to build a little house, for which they had the material, and place therein a telegraph instrument connected with the wire, and provided with one of the Collison batteries, which would remain in working order with a charge sufficient to last for forty years, and this, with a ground-wire run down through the ice to the solid earth, might make telegraphic communication possible to some subsequent visitor to the pole. But apart from the necessity of giving up connection with Sardis, the journey did not seem like such a strange and solemn progress through unknown regions as the northern voyage had been. If they could get themselves well down into the deep sea at a point on the seventieth line of longitude, they would sail directly south with every confidence of emerging safely into Baffin's Bay. The latest telegrams between Sardis and the polar sea were composed mostly of messages of the warmest friendship and encouragement. If Mr. Clewe and Mrs. Raleigh felt any fears as to the success of the first part of the return journey, they showed no signs of them, and Sammy never made any reference to his wife's frequently expressed opinion that there was good reason to believe that the end of this thing would be that the Dipsey, with everybody on board of her, would suddenly, by one of those mishaps which nobody can prevent, be blown into fine dust. Mr. Marcy's plan was a very simple one. The Dipsey carried a great store of explosive appliances of various patterns and of the most improved kinds, and some of them of immense power, and Mr. Marcy proposed that a long line of these should be laid over the level ice and then exploded. The ice below them would be shivered into atoms, and he believed that an open channel might thus be made, through which the Dipsey might easily proceed. Then another line of explosives would be laid ahead of the vessel, and the length of the canal increased. This would be a slow method of proceeding, but it was considered a sure one.