“I should say so,” replied Frank. “We---- Hello!”
“Now what’s the matter?” demanded Lord Hastings.
“Listen!” whispered Frank.
All three listened intently.
From astern came a choking “Chug chug.”
“We are followed!” exclaimed Frank. “We shall have to hurry. Is this as fast as this thing can move?”
Jack was tinkering with the motor.
“I guess it is,” he said at last. “However, we have quite a start, and with luck should be able to reach our vessel before they can overtake us.”
As swiftly as she could go the launch made for the spot where the submarine, still submerged, awaited them.
Brennan, whom Lord Hastings had left in command, was fully alive to his responsibility. Steadfastly he remained at his post, peering intently through the periscope. For hours he had been there, and now his patience was rewarded.