"Everything," replied the balloonist. "Are you going to start now?"
"Yes, we're deep enough for a speed trial. We'll go out to sea, however, and try for a lower depth record, as soon as there's enough water. Start the engine."
A moment later the powerful electric currents were flowing into the forward and aft plates, and the Advance began to gather way, forging through the water.
"Straight ahead, out to sea, Tom," called his father to him.
"Aye, aye, sir," responded the youth.
"Ha! Quite seaman-like, if you don't mind a reference to it," commented Captain Weston with a smile. "Mind your helm, boy, for you don'f want to poke her nose into a mud bank, or run up on a shoal."
"Suppose you steer?" suggested the lad. "I'd rather take lessons for a while."
"All right. Perhaps it will be safer. I know these waters from the top, though I can't say as much for the bottom. However, I know where the shoals are."
The powerful searchlight was turned, so as to send its beams along the path which the submarine was to follow, and then, as she gathered
