their might so as to get ahead of the ship. For a few minutes the struggle was intensely critical; for while they still slacked out the tightened line in one direction, and still plied their oars in another, the contending strain threatened to take them under. But it was only a few feet advance they sought to gain. And they stuck to it till they did gain it; when instantly, a swift tremor was felt running like lightning along the keel, as the strained line, scraping beneath the ship, suddenly rose to view u