“Mine, sir,” he said, quietly.

CHAPTER II.
WITHIN THE FORTRESS.

“Good work, Jack,” said Frank, approvingly.

“What do you advise?” asked Lord Hastings. “Up or down?”

“Depends on the depth, sir,” replied Jack.

“We’ll have a look at the chart,” said Lord Hastings.

He spread it out before him and the three pored over it for several moments.

“Here you are, sir,” said Frank, at last, placing a finger on the chart.

“Plenty of water,” was Lord Hastings’ comment. “Submerge another five fathoms, Mr. Templeton.”

Jack gave the order and then returned to his post.