By a strong effort he shook off these thoughts. If they did not find gold, he told himself, at least they had had the adventure and he, for one, wouldn’t have missed it for anything.

He found that the floating buoy must have shifted a little for he had not landed in the same spot as he had before. He had noticed particularly the formation of the coral beds as a guide to the hulk of the ship and now he found himself confronted by unfamiliar, though wonderfully beautiful coral rock.

He groped his way forward, moving as quickly as he could in the clumsy suit, retarded by the heavy pressure of the water. He knew by experience that the oxygen in the tank did not last long and so he must make the most of every moment when he could breathe without difficulty.

It was a nightmare sensation, groping there at the bottom of the sea, knowing the need for haste and yet being unable to hurry! The grotesque shapes of monster fish flashed by him and once a shark swam so close to him he could have touched it by reaching out the hooks that served him as hands.

He thought of what Jack Benton had said about the treed cat, but this time he did not grin. He was too anxious to reach the ship before his supply of oxygen gave out.

And then before him, looming out of the shadows as gaunt and gray as a ghost was the hulk of the pirate ship. Phil gave a cry of joy and lumbered heavily forward.

Once the line that connected him with the upper world wound about a projection of rock and he wasted precious time trying to disengage it. It would never do to repeat that other experience of his. Once had been quite enough!

At last he reached the boat, clambered over the rail and tried to find footing on its slanting slippery deck. He half walked, half slid to the first hatch and tried vainly to pry it loose. Swollen by water, its hinges hopelessly rusted, it would take a force greater than Phil’s to lift it.

Phil picked up the dynamite which he had carefully laid on the deck.

“It’s up to you, old son,” he said almost affectionately as he placed the charge close to the hatch and fastened to the fuse the wire which he had brought for the purpose. “You just get the hatches open and trust to Uncle Phil to do the rest!”