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CHAPTER XI
OPERATING THE SUBMARINE WITH A CAPTIVE CREW

The officer now saw that he was dealing with a man who understood the motives of those aboard the submarine, and it was also evident that the sympathy of the boys was turned from the young man. The latter had played his part to the ultimate.

"You have now done all and more than is required of you," said the captain, as he altered his tone of voice. "You have set the automatic device, which, in due time, would have sent this vessel to the bottom. I understand all these devices, and they will not avail you. I understand, as well as you do, that to open that box will cause an explosion; but it is necessary to make an example of you." Then, turning to the boys, he said: "You may go on deck. As for you, Mr. Officer, I shall detain you below a sufficient length of time to be sure that the automatic device gets in its work. We really have no use for the submarine."

He turned and started up the stairway, when the sub-lieutenant, with trembling voice, said: "I am powerless to prevent the explosion,–"

"Unless," interrupted the captain.

The officer nodded his head. "I supposed so!" continued the captain. "The lieutenant in the galley has the key which controls the automatic device. You may open the door and get the key, and from this time forward, if I find that you deceive me in the slightest degree, or make any attempt to injure the vessel, I will make it your grave without a moment's hesitation, and without the least compunction."

The sub-lieutenant moved toward the galley, and opened the door. In a moment he reappeared with the key and followed the captain to the conning tower.

Below the switchboard was a tiny slot. Into this the key neatly fitted, and upon giving a turn, a set of switches was exposed.

"These are the control circuits," he said.

"Turn them off and open the boxes below!" ordered the captain. This was done.

"Who are the men that operate the trimming tanks?" asked the captain.

"The machinist Scholer and his assistant Bracher," was the reply.

"Lieutenant," said the captain, addressing the commander of the chaser; "send those men on board."

When they appeared the captain continued: "You will go below with these men, and obey my signals, as we take the vessel to port, and remember, that if any part of the machinery is destroyed I will not guarantee to deliver you safely on shore."

As they disappeared, the trap-door was closed, and the boys were free, for the first time since the eventful morning, five days previous to this time, when they stepped aboard the submarine.

They now realized, in a particularly pointed manner, that while the air in a submarine seems to be fairly pure, it is filled with the most noxious fumes, due to the petroleum and lubricants, as well as to the odors due to cooking, all of which cannot be gotten rid of, however constantly the air-circulating apparatus of the ship is in operation.

The greatest efforts have been made to automatically discharge these odors, but the hundreds of dead corners within a hull of this character make it impossible to effect a thorough discharge, and when the trap-door finally closes down there is a peculiar feeling, not unlike seasickness, which seemed to attack one.

"I understand your feelings," said the captain, as he noticed the pale faces of the boys. "It is wonderful how you have been able to keep up, and not exhibit symptoms before this. I will have two seamen come over to assist me in the conning tower."

"I wish you wouldn't do that," said Alfred, as he placed his hand on his temples. "I am sure we will get over this in time."

"No, no; we want to stay with you, if you don't mind," insisted Ralph. "I am all right now," and he tried to smile, but it was not a very successful effort.

"Then I suppose I shall have to accede; yes, lieutenant, we can take care of the boat, but I shall expect you to act as our convoy," replied the captain.

The lieutenant directed his men to pull for the chaser, and the captain turned to the operating board. "Forward," the word was plain. The signal was made by two distinct rings. The propellers turned. The captain, with his hands on the wheel, turned to starboard and made a short turn. This brought the vessel alongside the chaser. A slight turn to port, then forward, and they glided alongside l'Orient.

The crew had been lined up on the port side, and the captain at the end of the bridge raised his cap in salute as they passed by.

"Where are we going?" asked Ralph, as he saw the prow pointing to the south. "Are we going to France?"

"What are those funny things bobbing up there for,—that whole line?" asked Alfred.

"They are the floats for the torpedo nets," replied the captain. "We are now on our way to go through the gates, and thus avoid the nets."

"Is that why we are following the torpedo chaser?" asked Ralph.

"Yes, and when once inside the lane, we will change our course and reach the English base for craft of this kind," said the captain.

The submarine followed the wake of the chaser for fully a half hour, when, for some reason, that boat stopped. As they neared it they noticed the sailors and marines aboard on the port side, and intently engaged in looking forward.

"What's up now, I wonder?" said Alfred, as he opened the door of the conning tower and stepped on the deck.

"Look at the floats ahead," said the captain.

On investigation two of them were noticed moving back and forth, and occasionally dipping in an unaccountable manner.

"Look at those fellows with the guns on the deck of the chaser," said Ralph.

Alfred looked up. He saw the gun crews at their stations, with the officers in charge of the guns standing at one side in attitudes of expectancy.

"I know," said Alfred. "They have caught one of them."

"Yes; and they are making the same efforts to get away that we were engaged in only a few hours ago," said the captain.

The chaser steamed back and forth in a quiet, determined way, the men never for a moment relaxing their watch.

"What are they trying to do with that funny-looking, big, fat gun on the side near the front end of the deck?" asked Ralph.

"That is a howitzer," answered the captain.

"What in the world do they want a howitzer for?" asked Alfred.

"To use it on the boat if it should get free from the net," replied the captain.

"Why don't they use it now?" asked Ralph.

"Because they do not want to destroy the boat unless it is absolutely necessary," answered the captain.

"But how will they know whether the boat gets away?" asked Alfred.

"By the condition of the floats," answered the captain. "You will notice that the two floats within range of the submarine's action are being dragged down. If the floats should be in a normal condition, or float on their true water line, which you can readily observe by glasses, it is evident that the submarine is free."

"And then that would be the time they would use the howitzers?" suggested Alfred.

"But how could they reach the submarine?" asked Ralph. "Do they know just where the vessel is now?"

"Yes, they can locate it within a hundred feet; but that would be near enough for their purpose," replied the captain.

"Do you mean," asked Alfred, "that they would send the shell from the howitzer anywhere near them, and that it would destroy the submarine even though it didn't hit it?"

"Yes; the detonating or rupturing effect of the high explosive in the shells is such that even though the explosion would take place a hundred feet from the hull, it would put it out of commission at once, and, in all probability, crush in the sides like an egg shell," said the captain.

"Why are they signaling?" asked Ralph, as the wig-wagging began.

"I think that's l'Orient in sight on the port side," replied the captain, after gazing in the direction indicated.

"Then the cruiser will take the position of the chaser?" said Alfred.

"Quite likely," answered the captain.

"Look at the smoke; she's coming this way," shouted Ralph.

The captain waved his hand to the lieutenant on the chaser, as he shouted: "They have responded to your signals."

As l'Orient approached and took up position, the chaser, with a parting salute, turned and started for its former course along the line of buoys. The boys looked back and kept their eyes on the moving buoys as far as they could see them.

"It will never get away," said the captain.

The chaser described a long curve, and changed its course due east, and, following it, they were at the entrance which had been left free. Beyond were several other small vessels, two of which dashed up and steamed alongside. The crews cheered as the boys emerged from the conning tower and waved their caps.

The lieutenant quickly informed the officers aboard the other boats of the prize, which had been taken by those aboard of her, and the news redoubled their noisy welcome. The tell-tale number on the side of the conning tower, U-96, was sufficient to inform the crews of the passing vessels that another of the dreaded boats was out of action.

Once within the lane, as the path between the two lines of buoyed nets is called, they turned and steamed north. Vessels were passing and repassing; transport and hospital ships; immense freight carriers, and saucy little tugs drawing barge-like flat-boats; innumerable fast launches and large war vessels, going to and fro between the shores of England and France.

Within a half-hour they again approached the place where l'Orient was watching the struggles of the entangled submarine. The boys thought of the trying hours when they, too, were thus imperilled, and could hardly refrain from shuddering at the thought of the human beings in the narrow prison house below the waves.

Evidently, something exciting was taking place, for the cruiser was constantly manoeuvering, and the men at the howitzers were keenly alive. Occasionally, there would be a lull in the movement of the buoys and it was during those moments that the most intense activity was shown on board the guarding vessel.

"I don't understand how it is that the submarine can get fastened to the nets," said Ralph to the captain, as they leaned over the rail of their vessel.

"The meshes of the nets are very large,—that is, of sufficient diameters to permit the ends of the submarines to pass into them," replied the captain.

"But, if that is the case why cannot the submarines back out in the same way that they went in?"

"They can, if the mesh is too small to take more than the bow of the vessel; but, in the event the mesh is large enough to permit the bow to enter, and the net once gets behind the fins of the submarine, that is the end of them, for the vessel cannot, in that case, free itself," responded the captain.

"How was it in our case?" asked Ralph. "Do you think the fins of our ship got caught?"

"I did not explain it to you at the time, as I did not wish to alarm you; but this vessel had one of its fins through the net. Evidently we struck the nets at an angle, and the tide helped us in keeping the hull against the net at the proper angle. The lieutenant knew this, for he adopted the only method known to free the ship under those circumstances," said the captain.

"So you think the lieutenant knew that only one fin had caught, and for that reason he tried to up-end the ship?" inquired Alfred.

"Yes; but not that alone. I observed one thing that you may have overlooked," remarked the Captain. "He was particular to store all the boxes which we helped to carry aft, on the starboard side."

"I noticed that," said Ralph hurriedly, "and that wasn't all. Every time a box was brought in he would ask: 'Heavy or light,' and I have many times wondered why he did so."

"I did notice one thing, though," said Alfred, "and that was, when the rear end of the submarine shot upward, and the boxes came tumbling down, that the hull seemed to roll around to the left."

"That was our salvation," replied the captain. "I then knew we had a chance."

CHAPTER XII
THE DEATH BLOW TO THE SUBMARINE

Let us try to get some idea of the situation. Ahead of the boat on which the boys were watching the scene, and probably not more than eight hundred feet distant, was l'Orient. Between them was the row of buoys, as far as the eye could see, stretching from the shore of England to the coast of France. To their right, and not two hundred feet distant was the saucy little chaser, which acted as their convoy.

At a point which might be termed midway between the three vessels thus described, were the two buoys, which moved with spasmodic jerks, due to the action of the imprisoned vessel below. As they looked along the bobbing buoys in either direction, small vessels were observed, patrolling to and fro, in the tiny mast, or lookout of each, being two or more men, with glasses, constantly scrutinizing the floats as the ships slowly moved past.

Apparently, at regular intervals, were large ships of war, all of them in motion. Sailing vessels and steamers, carrying freight, were coming up the channel, convoyed to the open doors in this giant network which guarded the channel.

The lieutenant on the chaser backed his vessel toward the submarine and hailed the captain:

"Do you wish to remain?" he asked.

"The chances of that fellow seem to be pretty slim. I would like to see the finish of the game; but I suppose we ought to get into port as soon as possible," answered the captain.

"Then I will give the order to proceed," replied the lieutenant.

The captain nodded, and the boys started for the door.

"One moment!" said the captain. "We may still be able to see an interesting sight."

The boys rushed out of the door. Glancing up at the deck of the chaser they could see the marines aboard rushing to the side of the vessel. As they looked at the buoys it was noticed that they were silent. L'Orient was slowly backing away from the obvious location of the submerged vessel.

"They are about to throw a shell," observed the captain.

The remark had hardly left his mouth when an explosion was heard and the shell could be observed moving upward at a very high angle, and descending into the water with a vicious plunge.

No sooner had it struck the sea than it seemed to raise the surface of the water like the foaming mass in a boiling pot. The explosion was dull, vibrant, ominous.

"They are shooting another one," shouted Alfred, although he tried to suppress his voice.

"Boom!" came the sound, as he uttered the words.

The second shot struck the water not fifty feet distant from the first one.

"Do you think they will fire another?" asked Alfred.

"Probably not," answered the captain.

"What is that little boat going over there for?" asked Ralph, as one of the torpedo boats boldly advanced over the spot where the two shells had entered the water.

The captain nodded his head for a few moments before speaking.

"The shots were successful."

"I can see that now," said Ralph. "Look at the oil coming up and covering the sea."

It was, indeed, a sad sight to witness, knowing that the shots meant the death of thirty or more human beings.

"Well, I am awfully sorry for them, even if they had no sympathy for us, and didn't wait to see whether or not we were put into safety before they sent our ship down," said Alfred reflectively, as he turned and entered the conning tower.

The scene had its fascination for Ralph, although he felt the horror of it all as he stood leaning over the railing, gazing at the patrol boats which were sailing back and forth in and around the spot where the petroleum was fast covering the surface of the water in all directions.

"You can understand now, can't you, why flying machines are such good spotters for submarines?" remarked the captain.

"Do you mean the oil that comes on top of the water?" asked Ralph.

"Yes," was the reply.

"But does oil arise at all times when a submarine is submerged?" asked Ralph.

"More or less oil is constantly detaching itself from the body of the hull, at the discharge ports, and it can't be helped because all of the gas discharge ports are under water at all times, whether the vessel is running on or under the water, hence, as it moves along it will leave a trail of oil which can be easily detected by a machine in flight above the surface of the water," said the captain.

"But doesn't a machine, when it is under the water, leave a ripple that is easily seen by a flying machine?" asked Ralph.

"Yes; I was going to refer to that," replied the captain. "An aviator has a great advantage over an observer on a vessel, for the reason that the slightest movement of the surface of the sea, even though there may be pronounced waves, can be noted. If the submarine is moving along near the surface, the ripple is very pronounced, and the streak of oil which follows is very narrow. Should the submarine stop, the oil it discharges accumulates on top of the water at one place, and begins to spread out over the surface of the water and this makes it a mark for the watchful eye of the airmen of the sea patrols," answered the captain.

"I heard one of the officers at the aviation camp say that a submarine could be seen easily through fifty feet of water by an airman," remarked Alfred. "Do you think that is so?" he asked.

"I know it is possible," replied the captain.

"But why is it that when you are on a ship it is impossible to see through the water that depth?"

"For this reason," answered the captain: "if you are on a ship, and you are looking even from the topmast of the vessel, the line of vision from the eye strikes the surface of the water at an angle. The result is that the surface of the water acts as a reflector, exactly the same as when the line of sight strikes a pane of glass."

"Do you mean that the sight is reflected just as it is when you are outside of a house and try to look into the window at an angle?" asked Ralph.

"Exactly; that is one explanation. The other is this: sea water is clear and transparent. By looking down directly on the water, a dark object, unless too far below the surface, will be noted for the reason that it makes a change in the coloring from the area surrounding it, and a cigar-shaped object at fifty feet below, whether it should be black or white, would quickly be detected," explained the captain.

"I remember that Lieutenant Winston, who has flown across the channel many times, told me that he could tell when he was nearing land, in a fog, by sailing close to the water, even though the land couldn't be seen. Do you know how he was able to do that?" asked Ralph.

"That is one of the simplest problems," replied the captain. "The shallower the water the lighter the appearance to an observer in an airship. As the water grows deeper the color seems to grow greener and bluer, the bluest being at the greatest depth."

The chaser was now under way, and described a circle to the right. The captain, after saluting the officer on the bridge of l'Orient, gave the signal "Forward," and slowly the submarine sheered about and followed.

The second line of buoys appeared a quarter of a mile to the east of the one they had just left. In a half-hour the two vessels passed through the gateway and turned to the north.

"We can't be very far from England," remarked Alfred.

"I judge we are fifteen miles from Dover," replied the captain.

"Do you intend to go to Dover?" asked Ralph.

"No; there are no stations there that can receive crafts of this kind. I do not know to what point they may take us; possibly to the mouth of the Thames, and from there to some point where the vessel will be interned," answered the captain.

"How deep is the channel here?" asked Ralph.

"Probably not to exceed 120 feet," was the reply.

"Not more than that in the middle of the Channel,—half way between England and France?" asked Alfred in surprise.

"No; the Channel is very shallow," answered the captain.

"No wonder then," said Alfred, "that the submarines are having such a hard time getting through, even though they don't have the nets!"

Having passed the cordon of nets the chaser turned and slowly steamed past the submarine. The lieutenant stepped to the side of the bridge and said:

"I suppose, Captain, you can now make the pier-head at Ramsgate, where you will get a ship to convoy you to the harbor. Good luck to you! Adieu!"

The boys waved their caps in salute, as the chaser began to move, and the crew lined up to give the final goodbye.

The captain smiled and replied: "I think I have ample assistance on board; give my regards to the admiral."

"How far is it to Ramsgate?" asked Ralph.

"It cannot be more than twenty-five miles, and at the rate we are now going we should reach the head at five this evening. That will be the end of our troubles, as the naval officials will take care of this vessel from that point," said the captain.

"Well, I shall be glad of it," replied Alfred.

It was a glorious day, the sun was shining brightly, and the air, although somewhat cool, was not at all disagreeable. The boys insisted on taking their turns at the wheel, the course being given by the captain as west by north. Everything was moving along in fine shape, and Alfred was at the wheel, while Ralph was peering through the periscope, for this interested them from the moment they boarded the ship.

"Where is that steamer bound?" asked Ralph, who noticed a large two-funnel steamer crossing the field of the periscope.

"It belongs to the Australian line," replied the captain.

"Aren't we in the barred zone?" asked Alfred.

"I was about to remark a moment ago that it does not seem as though the German edict of a restricted zone makes much difference in the sailing of vessels," replied the captain.

While speaking, the submarine seemed to slow down, and the captain turned toward the conning tower. "I wonder what is up now?" he asked.

Alfred's head appeared at the door and shouted: "They don't seem to answer my signals."

The captain entered the tower, and pulled the lever, Attention! There was no response to the signal below the word. He again rang, with the same result.

The Periscope

"I will open the hatch," said the captain.

It was quickly swung open. The sub-lieutenant appeared at the hatch with haggard face and staring eyes. "The captain has gone mad!" he shouted.

"I will go down if you want me to; I am not afraid," said Ralph.

The captain looked at him for a moment, and glanced down into the hatchway. "Why do you not obey my signals?" he asked.

The sub-lieutenant stared at the captain, but did not make a reply. "Answer my question!" shouted the captain.

The officer raised his face, threw up his hands, and fell back across the low railing, which served as a guard at the foot of the stairs.

"You may go down, and ascertain what is the matter, but use caution," said the captain.

Ralph stepped into the open hatch, and, as he did so, the captain laid his hand on his shoulder, and said: "Take out your revolver; do not trust those men for a moment, under any consideration; we know them too well."

Ralph quickly drew the weapon and held it in his hand, then cautiously descended. He passed the inert form of the officer on the rail, and not until he reached the last step did he see the doctor and the chief machinist by the side of the dynamo.

The doctor held a revolver, which he pointed straight at Ralph. "Drop that revolver!" shouted the doctor. "The lieutenant is dead, and the time fuse will soon send this ship to the bottom."

The moment he saw the revolver and heard the voice, Ralph dropped behind the stanchions to which the stairway was attached. The doctor's revolver was fired. Instantly the captain divined the cause. Without waiting for a warning cry from Ralph, he leaped into the open hatch, and saw the two men with their weapons. He covered them with his revolver.

"Come up!" he shouted to Ralph.

The latter raised up from his crouching position, with his revolver now leveled full in the faces of the two frenzied men. Before Ralph had reached the upper step both men in the hold fired, fortunately, without doing any damage.

The moment Ralph gained the deck the captain jumped out of the hatch and slammed it down.

"Now, quickly, boys; tie this rope to the railing close to the periscope tube, and arm yourself with the life preservers; there, you will find them under that couch," said the captain, as he quickly threw back the cover from the couch and handed out four preservers.

"Why do you want four?" asked Ralph, as he hastily buckled one of them around himself.

"To attach to the end of the line that you have just fastened to the rail," replied the captain.

The captain sprang out through the open door, and attached one of the life belts to the end of the line. The boys now noticed the coil of rope, which must have been more than a hundred feet in length.

"I wonder what that is for?" asked Alfred, as the captain disappeared.

"There," said the captain, as he again appeared at the door. "If she goes down that preserver will tell them where to fish for her."

"Do you think there is any danger?" asked Ralph.

"I do not know; I am not taking any chances. I have my opinion, though," replied the captain thoughtfully.

"Do you think they are going to blow up the vessel?" asked Alfred.

"No; but I am inclined to think that they have not been able to disconnect the automatic fuse, or, that the death of the lieutenant, if such should be the case, has prevented them from finding the secret key, and,–"

"That the sub-lieutenant has actually gone mad," interrupted Ralph.

The captain nodded, and continued: "Although they deserve death, still, I am not a barbarian, and shall give them a chance for their lives," and, saying this, he moved through the door, and, sighting a large steamer, gave a signal. Once, twice, three times he moved the flag from right to left. Almost immediately there was a response and two short whistles responded.

Before the great ship had time to stop, the forward end of the submarine moved upward with a violent heave, followed by an explosion that seemed to tear everything to pieces. Ralph was thrown clear of the top, and landed fully twenty feet from the side of the hull. Alfred and the captain seemed to be propelled to the stern of the ship and dashed into the waves at least fifty feet from the spot where Ralph had landed.

Ralph did not appear to be even stunned, but Alfred's head dropped lifeless on the side of the life preserver, and the captain was prompt to reach his side and support him so that his head was kept free from the water.

Ralph was bewildered at the suddenness of the affair, and, while splashing in the water, glanced first at the captain and Alfred, and then swung around to get a view of the big ship, which they had signalled. The submarine had vanished. The sea around appeared to be a mass of bubbles, and he could plainly see the petroleum which was oozing up.

Nothing was visible where the submarine floated but a single belt,—the life preserver which the captain had used as a buoy, to mark the location of the sunken vessel.