Del Mar's mind was working feverishly. Though he now had in his power the girl he both loved and also feared as the stumbling-block in the execution of his nefarious plans against America, he realized that in getting her he had been forced to betray the precious secret of the harbor itself.
At the point where he knew that the harbor was above him, hidden safely beneath the promontory, he took from under his arm a float which he released. Upward it shot through the water.
Above, in the harbor, a number of his men were either on guard or lounging about.
"A signal from the chief," cried a sentry, pointing to the float as it bobbed up.
"Kick off the lead shoes," signalled Del Mar to the others, under the water.
They did so and rose slowly to the surface, carrying Elaine up with them. The men at the surface were waiting for them and helped to pull Del Mar and his companions out of the water.
"Come into the office, right away," beckoned Del Mar anxiously, removing his helmet and leading the way.
In the office, the others removed their helmets, while Del Mar took the head-gear off Elaine. She stared about her bewildered.
"Where am I?" she demanded.
"A woman!" exclaimed the men in the harbor in surprise.