"And important papers?"
"I know nothing about that."
"What is the name of your boat?"
"The Shark."
"Appropriate name that!" laughed Jimmie. "Used to be the Diver, didn"t she?"
"I don"t know."
"What did you come here for?"
"To get the boat."
"And remove it?"
"Of course."
"That would have meant death to the boys who are out in the water at this time?"
"I suppose so. Say, there"s something wrong with your air machine. I know something about such contrivances, and this one acts as if a hose out in the sea had been cut!"
CHAPTER X
A CHASE ON THE OCEAN FLOOR
Jimmie listened for an instant. There certainly was something the matter with the air machine.
"Get a move on!" shouted the captive, "or we"ll all be food for the sharks directly."
"Remain quietly where you are, then," Jimmie said, with a significant flourish at the gun which he had no intention of using, except in a case of the direst necessity.
"Go!" shouted the other.
Jimmie did not know what to do. While he had learned a good deal about the submarine, he was by no means an expert in the handling of her.
His experience with the air machines had been very slight, as the boys had made little use of them.
"It"s getting close in here already!" cried the captive in alarm. "Why don"t you do something?"
"What is there for me to do?" asked the boy.
"Release me and I"ll fix it," suggested the other.
Before Jimmie could explain the foolishness of this proposition, he heard a pounding at the outer door of the water chamber. He bounded through the open doorway and looked out.
There was a helmeted face against the pane. The boy was motioning for the door to be opened.
"Now," mused Jimmie, "I wonder how he got up there? The lifting lines haven"t moved. Why didn"t he let me know he was coming up?"
"Hurry!" called the captive.
Jimmie knew, from the flounderings on the floor, that the fellow was again trying to get rid of the rope. He stepped to the door and lifted a hand in warning, then slid the bolts and guards so the water chamber door would open from the outside, then stepped back into the larger apartment and closed the door.
He heard a rush of water and knew that some one was entering. Then, satisfied that all was well, he turned to his prisoner.
The fellow was half out of the rope, and one hand was sneaking toward a heavy ax which lay not far off.
"Cut that!" cried the boy.
He stood guarding the man while the water chamber filled and emptied.
Then the door opened and Ned came in, helmet in hand. First, he turned a screw and the trouble at the air machine ceased.
"What the d.i.c.kens!"
Ned stopped short in the middle of the room as he turned and gazed in amazement at the prisoner.
"I"ve been fishin"," Jimmie explained, with a chuckle.
"What is it you caught?" asked Ned.
"This," said Jimmie, "is the original sea serpent!"
"Looks to me like Moore, Jr.," Ned said.
"No?" exclaimed the boy.
"Are you the son of Captain Moore?" asked Ned.
The other nodded.
"I thought you"d recognize me," he grunted. "I was a fool to come here."
"That"s about the only true word you"ve said since you came on board, I take it," Ned went on.
Young Moore scowled and bent his eyes to the floor.
Ned now turned to Jimmie and asked:
"Why didn"t you draw us up?"
"Why," replied the little fellow, "I never got the signal."
"Guess you were too busy getting your sea serpent," smiled Ned.