CHAPTER VI

The Tramp

Like a startled hare the unterseeboot fled for shelter. Not until she reached a depth of fifteen fathoms did she check her diagonally downward course. At intervals a dull booming, audible above the rattle of the motors, proclaimed the unpleasant fact that her antagonist was circling around the spot marked by the phosphorescent swirl and the iridescence of escaped oil, and was firing explosive grapnels in the hope of ripping open the U-boat's hull.

Kapitan Schwalbe, looking very grey in the artificial light, was standing behind the quartermaster. His hands were clenched in momentary apprehension. Beads of perspiration stood out upon his forehead. He was experiencing a foretaste of the torment of the lost.

As a submarine officer of the Imperial German Navy he was a failure. Only sheer luck had hitherto saved him from the fate that had overtaken scores of his brother officers in that branch of the service. Skilled as he was in the handling of a huge liner, he lacked the iron nerve that is essential to the man who has to risk his life in a steel box that, in ninety-nine cases out of a hundred, offers no means of escape in the event of a catastrophe.

Yet he had to do his duty, notwithstanding his utter distaste for submarine work. He had had no option. The officers of the British Navy volunteer for submarine duties; those of the German Navy are simply told off whether they want to or not.

The nerve-racking work was beginning to tell upon him. His orders condemned him to a forlorn hope, for the English Channel was known to be a death-trap for the under-sea blockaders. The sight of a trawler filled him with feelings akin to terror. The possibility, nay probability, of a merchantman carrying guns made him approach his intended prey with the utmost caution; yet, as he had remarked to Ross Trefusis, he had never torpedoed any vessel flying the red ensign without giving her warning.

But it was not chivalry that prompted Schwalbe to act with consideration. Had he been untrammelled he would have sent his prey to the bottom without compunction, for he had all the brutal instincts of the kultured Hun. It was a superstitious fear that held his frightfulness in check--a presentiment based upon the Mosaic Law, an eye for an eye and a tooth for a tooth.

Having placed a considerable distance between him and his attacker, Kapitan Schwalbe ordered the electric motors to be stopped. The ballast tanks were "blown", and cautiously U75 rose to the surface.

It was the best course open to her. The depth of the water was much too great to allow her to rest on the bed of the sea. On the other hand, in order to keep submerged, the motors would have to be in motion. No one knew better than Schwalbe that the British patrol-boats would be in a position to locate with uncanny certitude the presence of their quarry, unless the strictest silence were maintained by the fugitive.

So, ready to dive at the first alarm, U75 floated awash until such times as were considered favourable for getting under way. Decidedly this part of the English Channel was, for the time being at least, unhealthy; and Kapitan Schwalbe resolved to make for the Bristol Channel, where the dangers of being destroyed by modern mosquitoes were more remote.

Meanwhile Ross and Vernon had been sent back to the quarters in the alley-way, by the side of the motor-room. Not knowing the reason for the U-boat's sudden submergence, and consequently unaware of the danger that threatened her, they formed the erroneous impression that the submarine was about to attack.

"The old fellow gave us a pretty straight tip," remarked Vernon, when the chums found themselves alone. "All the same, I vote we get out of it at the first opportunity, favourable or otherwise."

"'Ssh," whispered Ross. "Someone might be listening. I don't see how you propose to clear out, though."

"We were on deck just now."

"We were," agreed Trefusis.

"It was fairly dark. All the men up for'ard were lying down. It would have been an easy matter to have dived overboard and swum for it, if we hadn't been twenty miles or more from land."

"There was a bright look-out kept, all the same," objected Ross. "And I wouldn't mind saying that if the submarine were closer inshore, getting a supply of petrol, for example, we should be closely watched. All the same, I'm with you if we get the ghost of a chance. But it's a rummy affair altogether. Fancy that chap knowing our names and the rank of our respective fathers."

"Ramblethorne must have told him that," said Vernon.

"I suppose so; but for what reason? By Jove, if we get out of this mess all right, we'll have something to talk about--having been prisoners on a German submarine!"

The lads were not allowed on deck again that night. Acting upon Haye's suggestion they "turned in", and slept fitfully until awakened by the noise of the watch being relieved.

The seaman, Hans Koppe, brought them their breakfast. The meal consisted of fish, coffee, and the usual black bread. By this time the captives had practically recovered from the effects of the injection. Haye's head was still painful, although the headache had left him.

They ate with avidity, owing possibly to the atmosphere of the confined space, which was highly charged with oxygen.

"What is the Captain's name?" asked Ross, when the man came to remove the breakfast things.

The sailor told him.

"Where are we now?" enquired Vernon.

The man winked solemnly.

"Afloat," he replied. "Be content with that."

Just then there were unmistakable signs of activity on the part of the submarine crew. Several men hurried along the alley-way, each with a set purpose. They paid little heed to the Englanders as they passed.

At their heels came Herr Rix, the Leutnant of the submarine. He was beaming affably.

"Goot mornings!" he exclaimed. "You come mit me, den I show you how we blockade."

He led the way to the compartment in which the bowl of the supplementary periscope was placed. It was now broad daylight, and consequently the bowl showed a distinct image. A junior officer was standing by, but on seeing Rix approach he saluted and moved aside.

"Look!" exclaimed the Leutnant.

Both lads peered into the bowl. On its dull sides, an expanse of sea and sky was portrayed. Beyond that they could see nothing, until Rix called their attention to a small dark object.

"Englische sheep!" he declared. "Now you vos watch."

He touched a metal stud. Instantly an arrangement of telescopic lenses came into play within the tube of the periscope, with the result that a small portion of the view was greatly magnified upon the object card. It revealed a tramp of about nine hundred tons. She had a single funnel painted black, with two broad red bands; two stumpy masts, with derricks, and a lofty bridge and chart-house abaft the funnel. She was wall-sided. Her rusty hull was originally painted black. Here and there were squares of red lead, showing that her crew had been engaged in trying to smarten her up before she reached port. Aft, frayed and dirty with the smoke that poured from her funnel, floated the red ensign.

The submarine began to rise. Although she tilted abruptly, the image of the tramp steamer still remained upon the object bowl. By an ingenious arrangement, the lenses were constructed to compensate for any deviation of the tube of the periscope from the vertical. The lads could see the bows of the U-boat shaking clear of the water, throwing cascades of foam off on either side as the passing craft forged ahead at at least eighteen knots.

Now, for the first time, the skipper of the tramp saw the danger. He was a short, thick-set man, with white hair and an iron-grey moustache, and a face the colour of mahogany. For an instant he grasped the bridge-rails and looked towards the submarine, then gesticulated violently to the man at the wheel.

The spikes ran through the helmsman's hands, as he rapidly revolved the wheel actuating the steam steering-gear. The tramp swung hard to port, with the idea of baffling the momentarily expected torpedo.

Kapitan Schwalbe acted up to his principles. In any case he was loath to use a torpedo upon a comparatively small vessel. In response to an order, half a dozen of the submarine's crew swarmed on deck, three going for'ard and three aft. Within forty-five seconds the two disappearing guns were raised from the water-tight "houses".

Ross, Vernon, and the German Leutnant remained gazing into the bowl of the periscope. The vision so absorbed the attention of the two lads that they hardly heeded the presence of Herr Rix, who occasionally emitted grunts of satisfaction or annoyance as the scene was enacted.

The bow gun spat viciously. The range was but three hundred yards. The missile passed a few feet in front of the tramp's bows, and, throwing up a shower of spray that burst inboard on the British vessel's fo'c'sle, ricochetted a mile or so away.

The tramp's skipper showed his mettle. Round swung the vessel, listing heavily as she did so. By this time the call for more steam had been responded to, and dense clouds of black smoke belched from her funnel, mingled with puffs of white vapour as the siren bleated loudly for aid.

Running awash, U75 had a great advantage of speed; overtaking her prey she was able to send half a dozen shells into the lofty target presented as she slid by.

Holes gaped in the thin plating close to the waterline. A shell, passing completely through the funnel, demolished the siren. Being without wireless, the tramp was now without means of long-distance signalling.

Another missile hit the chart-house and, exploding, swept the frail structure overboard in a thousand fragments. The old skipper, hit by a splinter of wood, fell inertly upon the bridge; but the next instant he staggered to his feet, bawling to the crew to get the hand-steering gear connected.

"He's down again!" exclaimed Ross breathlessly, as the brave old man dropped upon the shattered planking of the bridge. "Hurrah! He's still alive."

The skipper had deliberately taken cover behind the slender shelter afforded by the metal side-light boards. By the frantic movement of his arm, it was evident that he was exhorting his men to "stick it" like Britons.

The hail of shells continued. Already fire had broken out on board in several places. A sliver of metal sheered through the ensign staff. Without hesitation one of the crew rushed off, retrieved the weather-worn bunting, and made his way to the mainmast.

Slowly and deliberately he re-hoisted the ensign until it fluttered proudly from the truck, then with apparent unconcern the man disappeared below.

By this time the tramp was again under control, with a course shaped for land, which lay about ten miles to the S.S.E. It was, however, a foregone conclusion that unless help were speedily forthcoming the vessel was doomed.

The tramp began to heel, almost imperceptibly at first, then with increasing speed. She had received her _coup de grace_.

Still the engines were kept going full speed ahead. The dauntless skipper remained on the bridge, with a look of grim resolution on his weather-beaten features.

Slowly the vessel's way diminished. Her bow-wave, owing to the gradually increasing draught, was greater, but less sharp than before. In a few minutes the water would be pouring over her fore-deck.

Seeing that their work was completed, the pirates ceased fire, the guns' crews standing with folded arms and stolidly watching the tramp as she struggled in her death-throes.

Presently a vast cloud of steam issued from her engine-room. The inrush of water had damped her furnaces. The engineer and firemen, their faces black with coal-dust and streaming with moisture, hurried on deck.

For another quarter of a mile the doomed vessel carried way, then came to a sudden stop. As she did so she gave a quick list to starboard, until only a few inches of bulwark amidships showed above the waves.

Then, and only then, did the skipper give orders for the boats to be lowered. In an orderly manner the crew manned the falls, and the task of abandoning the ship began.

Without undue haste, the crew dropped into the waiting boats, each man with a bundle containing his scanty personal effects wrapped up in a handkerchief. The Captain was the last to leave. He did so reluctantly, his left hand tightly grasping the ship's papers.

Having rowed a safe distance from the foundering vessel, the men rested on their oars, and waited in silence for the end. It was not long in coming.

The tramp was heeling more and more, and slightly down by the bows. Suddenly she almost righted; then, amid a smother of foam as the compressed air burst open her hatches, she flung her stern high in the air.

Even then she seemed in no hurry. The after part from the mainmast remained in view, the now motionless propeller being well clear of the water.

For quite a minute she remained thus, then with a quick yet almost gentle movement slid under the waves. The last seen of her was the weather-worn red ensign still fluttering from the truck.

The periscope's bowl showed nothing but an expanse of sea and sky, and the two boats rising buoyantly to the waves.

A grim chuckle brought Ross and Vernon back to their surroundings. Herr Rix was rubbing his hands and grunting with evident satisfaction.

"Goot!" he ejaculated. "Now, how you like dat? Now you see how we German make blockade, hein?"

"A brave deed," replied Ross scornfully, and, gripping Vernon by the arm, led him back to their uncomfortable quarters in the alley-way.