“According to my calculations we should now be in the Sea of Marmora. We will go up for a look about, Mr. Templeton.”

The D-16 rose until her periscope showed Lord Hastings the signs about her.

“Very good,” he said slowly. “You may go down to your previous depth.”

The D-16 sank again.

“See anything, sir?” asked Frank.

“Enough to know that my calculations were correct and that we are in the Sea of Marmora.”

“Any vessels in sight, sir?”

“Couple of merchantmen, as nearly as I could make out.”

“Did they see us, sir?”

“I think not. In fact I am sure of it.”