"Where's Elaine?" I interrupted breathlessly.

They began to tell me.

"Aren't you going to follow?" I cried.

"Follow? How can we follow?"

Excitedly I told of my discovery of the helmets.

"Just the thing!" exclaimed the hermit. "Send some one back to get them."

Woodward quickly detached several soldiers to go with me and I hurried back to the bungalow, while others carried the submarine telescope to the boat.

It was only a few minutes later that in Del Mar's own car, I drove up to the wharf again and we unloaded the curious submarine helmets and suits.

Quickly Woodward posted several of his men to act as sentries on the beach, then with the rest we climbed into the launch and slipped off down the sh.o.r.e.

The launch which Woodward had commandeered moved along in the general direction which they had seen Del Mar and his men take with Elaine.

With the telescope over the side, we cruised about slowly in a circle, Arnold gazing through the eyepiece. All of us were by this time in the diving-suits which I had brought from Del Mar's, except that we had not yet strapped on the helmets.

Suddenly Arnold raised his hand and signalled to stop the launch.

"Look!" he cried, indicating the eyepiece of the submarine telescope which he had let down over the side.

Woodward gazed into the eyepiece and then I did, also. There we could see the side of a submerged submarine a short distance away, through the cave-like entrance of what appeared to be a great under-water harbor.

"What shall we do?" queried Woodward.

"Attack it now before they are prepared," replied the hermit decisively. "Put on the helmets."

All of us except those who were running the launch buckled on the head-pieces, wrapping our guns in waterproof covers which we had found with the suits.

As soon as we had finished, one after another, we let ourselves over the side of the boat and sank to the bottom.

On the bottom we gathered and slowly, in the heavy unaccustomed helmets and c.u.mbersome suits, we made our way in a body through the entrance of the harbor.

Upward through the archway we went, clinging to rocks, anything, but always upward.

As we emerged a shot rang out. One of our men threw up his arms and fell back into the water.

On we pressed.

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.

They fired sharply at the figures that rose from the water. Many of the men fell back, hit, but, in turn, a large number managed to gain a foothold on the ledge.

Led by Woodward and Arnold, they formed quickly and stripped off the waterproof coverings of their weapons, returning the fire sharply.

Things were more equal now. Several of Del Mar's men had fallen. The smoke of battle filled the narrow harbor.

In the office Elaine listened keenly to the shots. What did it all mean? Clearly it could be nothing less than a.s.sistance coming.

The man on guard heard also and his uncontrollable curiosity took him to the door. As he gazed out Elaine saw her chance. She made a rush at him and seized him, wresting the rifle from his hands before he knew it. She sprang back just as he drew his revolver and fired at her. The shot just narrowly missed her, but she did not lose her presence of mind. She fired the rifle in turn and the man fell.

A little shudder ran over her. She had killed a man! But the firing outside grew fiercer. She had no time to think. She stepped over the body, her face averted, and ran out. There she could see Del Mar and his men. Many of them by this time had been killed or wounded.

"We can't beat them; they are too many for us," muttered Del Mar.

"We'll have to get away if we can. Into the submarine!" he ordered.

Hastily they began to pile into the open hatch.

Just as Del Mar started to follow them, he caught sight of Elaine running out of the office. Almost in one leap he was at her side.

Before she could raise her rifle and fire he had seized it. She managed, however, to push him off and get away from him.

She looked about for some weapon. There on the ledge lay one of the hand grenades. She picked it up and hurled it at him, but he dodged and it missed him. On it flew, landing close to the submarine. As it exploded, another of Del Mar's men toppled over into the water.

Between volleys, Woodward, Arnold and the rest pulled off their helmets.

"Elaine!" cried Arnold, catching sight of her in the hands of Del Mar.

Quickly, at the head of such men as he could muster, the hermit led a charge.

In the submarine the last man was waiting for Del Mar. As the hermit ran forward with several soldiers between Del Mar and the submarine, it was evident that Del Mar would be cut off.

The man at the hatch climbed down into the boat. It was useless to wait. He banged shut and clamped the hatch. Slowly the submarine began to sink.

Del Mar by this time had overcome Elaine and started to run toward the submarine with her. But then he stopped short.

There was a queer figure of a hermit leading some soldiers. He was cut off.

"Back into the office!" he growled, dragging Elaine.