CHAPTER X.
IN DIRE DANGER.
“Cl-a-a-a-ng!”
The signal, twice repeated, crashed out from the bronze gong under the engine room telegraph.
“What’s the order, Jack?”
Tom gazed anxiously at the young chief engineer of the diving boat as he put the question.
“Rise!”
The two boys exchanged glances. This meant that the instant had arrived that was to prove the success or failure of the invention. Once more Jack’s agile fingers busied themselves with levers and wheels.
“You have set the propellers to a rising position?”
“Yes, Tom; a few seconds now will tell the story.”