Upward we climbed until at last we came to the opening.  There we paused and looked about.  Where was Del Mar?  Where was Elaine?  We could see no trace of them.

Finally, however, Arnold discovered the trail in the grass and we followed him, slowly picking up the tracks.

. . . . . . .

Knowing that the submarine would cruise about and wait for him, Del Mar decided to leave Elaine in the hut while he went out and searched for a boat in which to look for the submarine.

Coming out of the hut, he gazed about and moved off cautiously.  Stealthily he went down to the shore and there looked up and down intently.

A short distance away from him was a pier in the process of construction.  Men were unloading spiles from a cable car that ran out on the pier on a little construction railway, as well as other material with which to fill in the pier.  At the end of the dock lay a power-boat, moored, evidently belonging to some one interested in the work on the pier.

The workmen had just finished unloading a car full and were climbing back on the empty car, which looked as if it had once been a trolley.  As Del Mar looked over the scene of activity, he caught sight of the powerboat.

“Just what I want,” he muttered to himself.  “I must get Elaine.  I can get away in that.”

The workmen signalled to the engineer above and the car ran up the wharf and up an incline at the shore-end.

The moment the car disappeared, Del Mar hurried away in the direction he had come.

At the top of the grade, he noticed, was a donkey engine which operated the cable that drew the car up from the dock, and at the top of the incline was a huge pile of material.

The car had been drawn up to the top of the grade by this time.  There the engineer who operated the engine stopped it.

Just then the whistle blew for the noon hour.  The men quit work and went to get their dinner pails, while the engineer started to draw the fire.  Beside the engine, he began to chop some wood, while the car was held at the top of the grade by the cable.

. . . . . . .

In our pursuit we came at last in sight of a lonely hut.  Evidently that must be a rendezvous of Del Mar.  But was he there?  Was Elaine there?  We must see first.

While we were looking about and debating what was the best thing to do, who should appear hurrying up the hill but Del Mar himself, going toward the hut.

As we caught sight of him, Arnold sprang forward.  Woodward and I, followed by the soldiers also jumped out.

Del Mar turned and ran down the hill again with us after him, in full cry.

While we had been waiting, some of the soldiers had deployed down the hill and now, hearing our shouts, turned, and came up again.

Beside his engine, we could see an engineer chopping wood.  He paused now in his chopping and was gazing out over the bay.  Suddenly he had seen something out in the water that had attracted his attention and was staring at it.  There it moved, nothing less than a half-submerged submarine.