Not only the plank, but the whole raft moved under this inexplicable impulsion,—which had communicated to it a rocking motion, not from side to side, but upwards and downwards! So quick and violent was this mysterious oscillation, that it was with difficulty the three individuals who still occupied the decks of the craft could keep either their balance or their feet.
Along with the motion of the raft there was a corresponding commotion in the water,—accompanied by a loud splashing noise that seemed to proceed from under the timbers, on which, like so many acrobats, they were endeavouring to balance themselves; and in a few seconds after they had felt the great shock, the sea all around exhibited a surface of high waves crested with foam!
Snowball, who had risen to the surface after the somersault that had plunged him deep down into the sea, perceiving that the raft still continued to heave upward and downward, made no attempt to get on board; but swimming alongside, sputtered forth his terrified ejaculations. Even the brave man-o’-war’s-man, who had faced death in a thousand shapes, was, at that moment, the victim of fear.
How could it be otherwise? He could think of nothing in nature capable of causing that mysterious commotion and who, without trembling, could withstand the assaults of the supernatural?
“Shiver my timbers!” cried Ben, himself shivering as he spoke the words, “what in old Nick’s name has got under us? Be it a whale that’s bumpin’ its back against the rail? Or—”
Before he could pronounce the second interrogatory, a loud crash sounded in the ears of all,—as if the plank heaving so mysteriously had been suddenly torn in twain!
This sound, whatever had caused it, seemed to proclaim the climax of the commotion: for immediately after the Catamaran began to compose herself, the waves caused by her continued rocking gradually grew less, until at length, once more “righted,” she lay in her customary position upon the tranquil surface of the sea.