Click! The professor snapped the switch shut. There was a burst of bluish-green flame, and the movement of the boat suddenly ceased. "I guess that does for 'em!" shouted Andy. "Wait a few minutes," advised the professor. "The suckers may not all be dead yet!" He kept the current flowing throughout the length of the ship for several minutes, and then turned it off. "Now to see if the plan worked," he said. The windows in the cabin were eagerly scanned. "Hurrah!" cried Mark. "The suckers have gone!" "I guess the electricity killed them," spoke Mr. Henderson. "We will venture out now in our diving suits and see what sort of a place we are in." Soon the adventurers were arrayed in the heavy suits. Under them they wore thick clothing, and in each suit was placed a small flat heater, operated by a storage battery. The heaters were made of coils of fine wires, and the electric current, meeting with much resistance in passing through them, heated the coils, so there was considerable warmth. It was all needed as they found when they felt the water entering the diving chamber, for the fluid was as cold as an ocean full of icebergs could make it. Protected however by the heavy suits, warm clothing and the heaters the divers were fairly comfortable. The outer door was opened and they all started back in amazement at the sight which met their eyes. Before them lay a forest of real trees, with bushes growing among them, while the ground, instead of being like the usual ocean bed was covered with grass. As Washington had said, on getting a small view of the place from the little window, it was real land under water. Their first surprise at the strange spectacle over, the adventurers glanced about for a sight of the terrible sea suckers. But they need not have feared. Lying in a huddled up mass toward the rear of the _Porpoise_ were the dead bodies of the ugly creatures. The electricity had finished them. CHAPTER XXVII ATTACKED BY AN OCTUPUS They walked some distance away from the ship, for the land under the water was easy to travel on. It looked exactly as if some beautiful valley had suddenly been submerged in the middle of summer, when everything was fresh and green. They had gone perhaps a quarter of a mile from the _Porpoise_ when Professor Henderson motioned to them that they had better return. On their way back they passed what looked to be a large cave in the side of a hill. Wondering what could be in it, Mark and Jack paused to peer into the black opening. The next instant two long white things, like slender serpents shot out. With the rapidity of lightning they wrapped themselves, one about each boy, and, before the horrified companions of the lads could do anything the unfortunate youths were whisked out of sight into the cavern.