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Rh As a result, the submarine boat was allowed to drift down the harbour with the ebbing tide, until she came abreast the great black hull of a man-of-war. Then she imperceptibly sank beneath the surface.



The watch officer of the Spanish cruiser, leaning on her after-rail and gazing musingly down into the dark waters sweeping seaward, speculated idly concerning the stream of phosphorescent light tailing out from under her counter, but thought of it only as a natural phenomenon. Had he known that it was caused by the motion of the Mermaid's propeller necessary to hold her in position against the stream while she hovered like a gigantic fish directly above the screw of his ship, how easily could he have won the promotion for which he longed. But he suspected nothing; and as Carl Baldwin, working from the diving chamber of the submarine craft, had succeeded in fastening one end of a short length of stout wire rope to the propeller blade, and shackling