While in this state of doubt he wandered away from the spot for some ways.
Again a strange drowsiness came upon him. He could not help but yield to it.
He waited for a time, fighting off the sensation. Then selecting a secluded spot under the reef, he sank down.
In a few moments he was sound asleep. The water surged about his prostrate form, little fishes came and peered in at the windows of his helmet.
But nothing of this kind woke him. How long he slept he knew not.
But when he woke up all was a glare of light about him. He was some while collecting his scattered senses.
Then he arose and looked about him. His whole being thrilled.
“Saved!” he gasped.
It was no dream. Not fifty yards distant was the submarine boat, Dolphin.
Frank at once started for it. He reached its side and clambered over the rail.