Lawless turned his back on him in disgust. It was quite true that they might have done as Trent suggested, but the idea had not previously occurred to him. It was too late now, for it would take at least half a day to accomplish, and the Zeppelin could hardly be expected to wait complacently while those below made ready for her destruction. Suddenly there was a loud explosion just to starboard of the destroyer, and a column of water arose so close that, in subsiding, it washed over the deck. "By Jove, she's dropping bombs!" exclaimed Lawless, at the same time ringing down "Full-speed" to the engine-room. However, in a few moments they had passed out of danger, and the airship was lost in the mist. The firing to the north-west still continued, though with decreasing vigour, as if fewer ships were engaged. This suggested to Lawless that some of the enemy vessels were drawing off, in which case he might possibly meet one or more on their flight back to the fastnesses of Heligoland. "This is where we keep our eyes skinned and stand-by for trouble," said the Lieutenant as he reduced speed again. "See anything, Trent?" "Not yet," answered the latter, who was straining his eyes in an endeavour to penetrate the fog. About ten minutes afterwards there came the heavy thud of ship's engines going at full speed, though as yet nothing could be seen of the ship itself. The situation for those on board the _Knat_ was one of infinite peril, for they did not know from one moment to another when, from out of the enveloping fog, a great towering mass might hurl itself upon their frail craft and send it to the bottom. Yet for obvious reasons Lawless dared not make any signal or betray his presence to the unknown monster advancing at, probably, between thirty or forty knots an hour. Suddenly the fog seemed to be thrust aside by a huge bulk, black and solid against the impalpable curtain of mist. For a moment it looked as if the destroyer must inevitably be crushed beneath the ocean Juggernaut advancing upon her. "Hard a port!" shouted Lawless, and instinctively gripped the bridge-rail as if bracing himself for a terrific shock. "Hard a port 'tis, sir," echoed the quartermaster, and sent the little wheel spinning round. Had the Lieutenant hesitated for the fraction of a second before giving the order the _Knat_ would have been cut in twain like a rotten log. But, as it was, the destroyer swerved to starboard in the nick of time, her side almost grazing the bows of the unknown ship as she passed. "A narrow squeak that," murmured Trent under his breath. "Could you make anything of her?" asked Lawless as the fog once more closed in on them and hid the other vessel from sight, though her engines could still be heard. "No," answered the junior officer; "she might be British, German or Dutch for all I can tell." "Then I think we'll keep on her track for a bit," said the Lieutenant. "Something'll give her away sooner or later."