"And leave Ned and Jack?"
Jimmie's jaw fell. This was something he had not thought of. The boys were still on the island—might be in great peril.
"Well, jump up to the surface," the lad said, then, "and I'll go to the island and see what's up."
"Fine chance you'd stand!" laughed Frank.
"Bet I can go ashore an' find a Boy Scout!" returned Jimmie. "We've found 'em in every part of the world."
The Shark was still in view, her lights creating faint mists under the water, but the boys did not consider her a formidable opponent now, so they lifted to the top of the ocean.
Jimmie was first out on the conning tower. The sun was still shining brightly and the water lay as quiet as the surface of a pond on a still day.
When the boy turned to the white line of sand at the rim of the sea he saw Ned and Jack standing there with two others. He waved his hat and Jack swung back from where he stood.
"Guess they've found some one worth talking with," Frank remarked, stepping up on the conning tower.
"Guess they have," responded Jimmie, "but there's some one creeping up to 'em from the thicket," he added, lifting his glasses. "Look out, boys!" he shouted, waving one hand frantically. "Look out! There's some one makin' a sneak on you!"