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.
As to the progress over the snow and ice of those who were to lay the lines of shells, that would be easy enough. It had been supposed that it might be necessary for the party to make overland trips, and for this purpose twenty or more electric-motor sledges had been provided. These sledges were far superior to any drawn by dogs or reindeer; each one of them, mounted on broad runners of aluminium, was provided with a small engine, charged at the vessel with electricity enough to last a week, and was propelled by means of a light metal wheel with sharp points upon its outer rim. This wheel was under the fore part of the sledge, and, revolving rapidly, its points caught in the ice or frozen snow and propelled the sledge at a good rate of speed. The wheel could be raised or lowered, so that its points should take more or less hold of the ice, according as circumstances demanded. In descending a declivity it could be raised entirely, so that the person on the sledge might coast, and it could at any time be brought down hard to act as a brake.
As soon as it was possible to get everything in order, a party of six men, on electric sledges, headed by Mr. Marcy, started southward over the level ice, carrying with them a number of shells, which were placed in a long line, and connected by an electric wire with the Dipsey. When the party had returned and the shells were exploded, the most sanguine anticipations of Mr. Marcy were realized. A magnificent canal three miles long lay open to the south.
Now the anchor of the Dipsey was weighed, and our party bade farewell to the polar sea. The great ball buoy, with its tall pole and weathervane, floated proudly over the northern end of the earth's axis. The little telegraph-house was all in order, and made as secure as possible, and under it the Dipsey people made a “cache” of provisions, leaving a note in several languages to show what they had done.
“If the whale wants to come ashore to get somethin' to eat and send a message, why, here's his chance!” said Sammy; “but it strikes me that if any human beings ever reach this pole again, they won't come the way we came, and they'll not see this little house, for it won't take many snow-storms—even if they are no worse than some of those we have seen—to cover it up out o' sight.”
“I don't believe the slightest good will ever result on account of leaving this instrument here,” said Mr. Gibbs; “but it seemed the right thing to do, and I would not be satisfied to go away and leave the useless end of the cable in these regions. We will set up the highest rod we have by the little house, and then we can do no more.”
When the Dipsey started, everybody on board looked over the stern to see if they could catch a glimpse of their old companion, the whale. Nearly all of them were sorry that it was necessary to go away and desert this living being in his lonely solitude. They had not entered the canal when they saw the whale. Two tall farewell spouts rose into the air, and then his tail with its damaged fluke was lifted aloft and waved in a sort of gigantic adieu. Cheers and shouts of good-bye came from the Dipsey, and the whale disappeared from their sight.