There are beaches where persons have bathed in safety for years. Then all at once some day a shrieking man or woman is seized, as though by some hidden monster, and is dragged off to death. That mighty and erratic force is called an undertow. It is now here, now there. It is born out of diverted currents, checked tide rips. It sneaks up bays, seeking prey; it roams along open Peaches. I know a lot more about undertows, but that’s all for now.

I was in one that day off San Apusa. Wind, tide, a current wandering off its course—one of the currents that is uncharted and which is known only by some diver who meets it on its wanderings below the surface, had combined, and had come to play in the vicinity of the wreck of the old Golden Gate.

I struggled on toward that wreck. Say, I met an old friend of mine. It was the mushroom anchor, and it was doing a sort of jig on top of a sand ridge when I first saw it. Evidently it had been lonesome during the night, and it had come to meet me. It was at least one hundred feet on the sea side of the wreck—and I had left it with fluke buried close to the ribs. If that undertow had dug up that anchor it might be doing other things. That thought came to me like a flash of hope. There’s no telling what an undertow will do when it gets to prancing, you know!

I unlashed the crowbar from the anchor stock and tumbled on over the ridges. I found myself in an opaque yellow light instead of in the green radiance I had found on my other two trips, and I knew that the sand was in motion inshore. When I came to the wreckage of the steamer I did not know my way about. The undertow had been dragging away the packing of sand here and there. More bulk of the débris was displayed, so far as I could judge by touch and by what I could see in the dim light. I groped my way along to the great ribs which showed above water, in order to get my bearing. It was a fight to get there. I was thrashed about and tossed and slatted. I wasn’t exactly sure when I did get there, for other parts of’ the wreck had been uncovered so much that one could easily be deceived in water in which boiled so much sand that it was like working in soup.

However, I toiled back after I reckoned I had located the marker.

Yes, the old Pacific had truly had a change of heart since the day before. The unseen fingers of that freakish undertow had been at work—they were still at work. They were scooping out sand instead of piling it in. I can best describe the appearance of things by saying that there was a smother of sand in the swirling water. Now and then the water cleared when the undertow let go its tuggings for a moment, and I could see parts of the steamer which formerly had been hidden from me.

When I had counted the paces that should bring me in the neighborhood of the treasure, I set my crowbar into the sand with all the strength I could muster, and twisted it around and around in order to loosen the stuff. It was wonderful how quickly the water dragged away what I set free from that pack.

A bottle came bouncing up out of the hole. I dislodged pieces of broken crockery. Ingot Ike had said that the treasure had been stored in a compartment of the ship near the pantry. The sight of that jetsam encouraged me. I stabbed with all my might, drove the crowbar in again and again, struggled to hold myself on bottom, and muttered appeals to that undertow in my frenzy of toil. I do not know how long I worked. I do know that all my sensations informed me that I was remaining beyond my limit of endurance. But the conviction came to me that this was not a chance to be neglected. I was in a fever of hope. I wanted to show that coward of a Marcena Keedy that a strong man could call the bluff of a loafer’s sneers. I wanted to convince Capt. Rask Holstrom that he had not picked out a piker, and perhaps I wanted a girl to give me the smile which success ought to win.

Well—and here’s to the point!—all at once, when I was near fainting, my crowbar struck something which was not bottles or crockery. I managed at last to get the point of the bar under the object. I could not see what it was. I only knew, as I worked the bar, edging it around the thing to dislodge the sand, that the object was oblong and had corners.

My buoyancy and the swing of the rolling sea would not allow me to pry with any great force. I could only pick at the sand and coax the box out. In the end I had it where I could get my fingers under the edges—and there’s one thing a diver can do: he can lift with the strength of a giant, the air in his dress assisting him.