From a point bearing half a mile on the vessel's port quarter, the track of the on-coming torpedo was clearly discernible. The
Straight for the source of the missile, tore the British craft, but her effort to grapple with the unterseeboot was in vain. The submarine had dived immediately. No sounds betrayed her presence in the vicinity. Had the U-boat been moving, the churning of her propellers would have been distinctly audible.
"She's got away, worse luck," growled Sub-lieutenant Fox. "I wonder how she did it? It's too deep for her to sound, and she can't be moving under her own power."
"We'll have her right enough," rejoined Barry, the optimist. "A light haze and a calm sea is what we want. We'll run her down in less than a week, you mark my words."
Four days passed. The
Yet nothing occurred to threaten the constant stream of shipping. It seemed reasonable to surmise that either the U-boat had met with an accident or else that she had transferred her energies to another area.
Meanwhile Ross and Vernon had been working hard, improving their seamanship. Under the instruction of the two sub-lieutenants they were making rapid progress in navigation; they could fix their position by the use of a sextant, were able to use the semaphore, and, generally, competent to carry out the duties required as midshipmen of the watch.
Captain Syllenger had long before overcome his prejudices against the sons of Flag Officers—at least in their case—and even expressed his willingness to grant them each a certificate of proficiency, should they wish to transfer to one of the cruisers of the Royal Navy.
At length the
The lads were heartily glad when the
Forty minutes after leaving French waters, the
Suddenly a low rumble was heard by the crew of the patrol-vessel. Telescopes and binoculars that had just been laid aside were again brought into action, and it was seen that the transport was sinking rapidly by the stern. She had been torpedoed under the starboard quarter. The terrific impact of the explosion had torn a large hole, besides shattering the rudder and one of the propellers, while all her boats in davits were rendered useless by the concussion.
It was a matter of but a few moments before she made her final plunge. Already signals were fluttering from her stumpy masts—the well-known N.C. (in distress; want immediate assistance) and A.R. (boats are stove in).
Captain Syllenger gave a quick glance astern. There were other vessels, but low down on the horizon. To expect succour from them was for the present out of the question. He had a double task: to attempt to destroy the aggressor, and to rescue the transport's crew.
"Prepare to lower boats!" he shouted. "A midshipman and a couple of hands in each. Guns' crews stand by!"
Clang, chang, went the engine-room telegraph. Like a greyhound, the
By this time Ross and Vernon were in their respective boats. Before way was off the ship the falls were paid out and the disengaging gear cast off.
"Give way, men," ordered Ross.