. . . . . . .
Elaine sat in a corner of the office, mute, while the man who was guarding her, heavily armed, paced up and down.
Suddenly an overwhelming desire came over her to attempt an escape. But no sooner had she made a motion as though to run through the door than the man seized her and drove her back to her corner.
"Take your positions here," ordered Del Mar to several of the men. "If you see anybody come up through the water, these hand grenades ought to settle them."
Along the ledge the men were stationed each with a pile of the grenades before him.
"See!" cried one of them from the ledge as he caught sight of one of our helmets appearing.
The others crouched and stared. Del Mar himself hurried forward and gazed in the direction the man indicated. There they could see Woodward, Arnold and the rest of us just beginning to climb up out of the water.
Del Mar aimed and fired. One of the men had thrown up his arms with a cry and fallen back into the water.
Invaders seemed to swarm up now in every direction from the water.
On the semi-circular ledge about one side of the harbor, Del Mar's men were now ranged in close order near a submarine, whose hatch was open to receive them, ready to repel the attack and if necessary retreat into the under-sea boat.