The moaning sound rapidly grew in intensity until it became first a deep roar, like the bellowing of a thousand angry bulls, and finally a deafening shriek, while away to the eastward a long line of white, foaming water became visible, rushing down toward us with incredible rapidity.  The next instant the squall struck us, and the white water boiled up high over the sterns of the boats, burying us so deeply that for a moment I thought it was all over with us, and that, despite our precautions, we must inevitably be swamped.  But the good canvas of which the longboat's sails were made fortunately withstood the strain, as also did the stout hemp rigging which supported the mast, and as the furious blast swooped down upon us we gathered way and were the next moment flying to the westward before the hurricane, our bows buried deeply in the boiling surge.  And now we had good reason to congratulate ourselves upon the fact that we in the longboat had taken the gig in tow, for the strain of the smaller boat kept the longboat's stern down, and in a great measure counteracted the leverage of the mast which tended to depress and bury our bows, but for which I feel convinced that the longboat, stout craft though she was, would have been driven under by the tremendous force of the wind and swamped by an inrush of water over the bows.