“She’s gone, sir,” he said quietly.

Lord Hastings turned to Jack.

“We’ll go to the surface at once,” he said.

Hardly had the D-16 bobbed up from beneath the water, when there was a loud boom from the Russian ship now but a short distance away, and a shell screamed overhead.

“Run up the British flag, quick, Mr. Templeton,” ordered Lord Hastings.

A moment later the Union Jack fluttered aloft.

Came another shot from the Russian, and a second shell screamed near.

“The fools,” cried Lord Hastings angrily. “What do they mean by that?”

“They think we are trying a ruse to get near them, I suppose,” replied Frank. “They are unable to tell we are not the same submarine that followed them.”

“True,” said his commander, “I hadn’t thought of that. But how are we to let them know who we are?”