The Young Engineers on the Gulf or The Dread Mystery of the Million Dollar Breakwater By H. Irving Hancock CONTENTS CHAPTERS I. The Mystery of a Black Night II. The Call of One in Trouble III. Vanishing into Thin Air IV. Some One Calls Again V. Wanted---Daylight and Divers VI. Mr. Bascomb is Peevish VII. Tom Isn't as Easy as He Looks VIII. Mr. Prenter Investigates IX. Invited To Leave Camp X. The Night is Not Over XI. A Message from a Coward XII. An Engineer's Fighting Blood XIII. Wishing It on Mr. Sambo XIV. The Black Man's Turn XV. A David for a Goliath XVI. A Test of Real Nerve XVII. Tom Makes an Unexpected Capture XVIII. The Army "On the Job" XIX. A New Mystery Peeps In XX. A Secret in Sight XXI. Evarts Hears a Noise XXII. Mr. Bascomb Hears Bad News XXIII. Ebony Says "Thumbs Up" XXIV. Conclusion CHAPTER I THE MYSTERY OF A BLACK NIGHT "I wish I had brought my electric flash out here with me," muttered Harry Hazelton uneasily. "I told you that you'd better do it," chuckled Tom Reade. "But how could I know that the night would be pitch dark?" Harry demanded. "I don't know this gulf weather yet, and fifteen minutes ago the stars were out in full force. Now look at them!" "How can I look at them?" demanded Tom, halting. "My flashlight won't pierce the clouds." Reade halted on his dark, dangerous footway, and Harry, just behind him, uttered a sigh of relief and halted also. "I never was in such a place as this before." "You've been in many a worse place, though," rejoined Tom. "I never heard you make half as much fuss, either." "I think something must be wrong with my head," ventured Harry. "Undoubtedly," Tom Reade agreed cheerily. "Hear that water," Harry went on, in a voice scarcely less disconsolate than before. "Of course," nodded Tom. "But the water can hardly be termed a surprise. We both knew that the Gulf of Mexico is here. We saw it several times to-day." The two young men stood on a narrow ledge of stone that jutted out of the water. This wall of stone was the first, outer or retaining wall of masonry---the first work of constructing a great breakwater. At high tide, this ledge was just fourteen inches above the level surface of the Gulf of Mexico, and at the time of the above conversation it was within twenty minutes of high tide. The top of this wall of masonry was thirty inches wide, which made but a narrow footway for the two youths who, on a pitch black night, were more than half a mile out from shore. On a pleasant night, for a young man with a steady head, the top of this breakwater wall did not offer a troublesome footpath. In broad daylight hundreds of laborers and masons swarmed over it, working side by side, or on scows and dredges alongside. "Wait, and I'll show a light," volunteered Tom raising his foot-long flashlight. Some seventy-five yards behind them a crawling snake-like figure flattened itself out on the top of the rock wall.