“We ought to get a name for that body of water up there,” said Mr. Gibbs, as he was writing out his report of the day's adventures. “Shall we call it 'Lake Clewe'?” “Oh, don't do that!” exclaimed Sammy Block. “Mr. Clewe's too good a man to have his name tacked on to that hole. If you want to name it, why don't you call it 'Lake Shiver'?” “That is a good name,” answered Mr. Gibbs; and so it was called. CHAPTER XI. THEY BELIEVE IT IS THE POLAR SEA With no intention of ascending again into any accidental holes in the ice above them, the voyagers on the Dipsey kept on their uneventful way, until, upon the third day after their discovery of the lake, the electric bell attached to the heavy lead which always hung suspended below the vessel, rang violently, indicating that it had touched the bottom. This sound startled everybody on board. In all their submarine experiences they had not yet sunk down low enough to be anywhere near the bottom of the sea. Of course orders were given to ascend immediately, and at the same time a minor search-light was directed upward through the deck skylight. To the horror of the observers, ice could plainly be seen stretching above them like an irregular, gray sky. Here was a condition of things which had not been anticipated. The bottom below and the ice above were approaching each other. Of course it might have been some promontory of the rocks under the sea against which their telltale lead had struck; but there was an instrument on board for taking soundings by means of a lead suspended outside and a wire running through a water-proof hole in the bottom of the vessel, and when the Dipsey had risen a few fathoms, and was progressing very slowly, this instrument was used at frequent intervals, and it was found that the electric lead had not touched a rock projecting upward, and that the bottom was almost level. Mr. Gibbs's instrument gave him an approximate idea of the vessel's depth in the water, and the dial connected with the sounding apparatus told him hour by hour that the distance from the bottom, as the vessel kept forward on the same plane, was becoming less and less. Consequently he determined, so long as he was able to proceed, to keep the Dipsey as near as possible at a median distance between the ice and the bottom.