Sub-lieutenant Crosthwaite was on the horns of a dilemma. His orders were to attempt the rescue of the crew of the mine-sweeper; he was also told to act in concert with the whaler of the _Tremendous_. The latter was nowhere in sight. Which ought he to do? Proceed to the wreck, or go in search of the missing boat? He made up his mind quickly. The trawler, although badly damaged, did not appear to be breaking up. If any of her crew were on board, having survived the breakers thus far, they ought to be able to hold on a little longer. He would search for the other whaler, or at least communicate the news of her being missing to Lieutenant Bourne and leave the two gigs to take up the search. "If she's capsized she'll drop dead to leeward," declared Midshipman Farnworth, referring to the lost boat. "We'll back in, sir; I think that will be the best way." "Certainly," agreed Dick cordially. He realized that the midshipman knew what he was about. Under the circumstances it was the safest way. Watching for an opportunity when a "smooth" occurred between the heavy crested seas, the midshipman contrived to get his boat's bows on to the general direction of the waves, which, owing to the shoaling of the depth, were almost on the point of breaking. A cauldron of foaming water stretched dead to leeward, and towards it the _Hammerer's_ whaler was slowly backed, the men ready at the hurried word of command to pull ahead directly a particularly vicious breaker bore down. Although a smart look-out was kept, no sign of the _Tremendous's_ boat was to be seen. It was like looking for the proverbial needle in a haystack, for, although the outlines of the encircling cliffs could be discerned against the rain-laden sky, objects on the water would be most difficult to distinguish even at a comparatively short distance. "This is as far as we dare go," remarked the Sub. "We'll be fairly in broken water if we drift in any farther. There's no sign of the boat and her crew." Bidding the men "give way", Dick awaited developments with certain misgivings. His expectations were presently to be realized, for the rowers, already exhausted by their efforts, were powerless to make the boat gain a foot. For twenty minutes they stuck gamely to their oars, driving the long, narrow craft through the crested waves, yet, owing to the force of the wind and the send of the sea, it seemed impossible to gain an offing. Meanwhile, all unbeknown to the _Hammerer's_ whaler, the boat of which they were in search had accomplished her errand. The heavy waves that had accounted for the two whalers becoming separated had smashed three oars of the _Tremendous's_ whaler. Before the spare ones could be substituted and the water baled out, the light craft had drifted many yards to leeward.