Ned hesitated. He really was alarmed at the situation. He knew how desperate the Moores must be, and he had no doubt that in some strange way the Diver had been brought to the scene of the wreck.
"If you and Frank are partial to a moonlight stroll under sixty feet of water," he finally said, "you may as well put on your water suits and look around."
"Leave Jimmie here to watch the boat and come with us," urged Jack.
"Go on," Jimmie advised. "I can run this shebang, all right. Go on and see what you can see."
"If we are going out to-night," Ned said, after reflection, "we may as well shift the Sea Lion and inspect the bottom over where we saw the apparent elevation."
"Yes; that may be the wreck," Jack admitted.
So the submarine was moved a short distance to the north, about the space which had seemed to separate the boys from the elevation, and preparations were made for going out. Jimmie was rather pleased at the idea of being left in charge of the submarine.
"Of course you'll not touch the machinery," Ned warned. "All you can do is to see that the air pumps are kept going. Any motion of the boat, you understand, might break or disarrange the hose carrying the air to us, so be careful."
"Oh, I guess I don't want to murder any of you," laughed the little fellow. "Go ahead and I'll run things all right on board the boat. I could operate her anywhere."
The Sea Lion was lifted only a trifle in order to make the change to the new location. As she moved along she was not much more than a fathom from the level sand below.