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Left alone in the Sea Lion, Jimmie spent most of his time watching
from a darkened window. He could distinguish little in the faint
sifting of moonlight which dropped down from the sparkling surface of
the sea, but there was companionship even in that.
He had been instructed by Ned to keep the interior dark, and so he
watched the ocean floor for the lights which his chums might be
obliged to turn on. As the reader knows, however, the exploring party
showed no lights at all until the interior of the wreck had been
gained.
Listening and waiting, half inclined to admit that he was just a
little bit lonesome, the boy stood at his post for about a quarter of
an hour. Then he saw an opaque object moving toward the submarine.
It was not a shark or other monster of the sea, for it walked upright
and seemed to move up and down as it came to the little undulations in
the ocean floor. When it came nearer Jimmie moved toward the door of
the water chamber.
"That must be Ned," he thought, "comin' back alone. Now, I wonder if
anythin' has happened to Frank an' Jack?"
For a moment the heart of the lad throbbed wildly, then he calmed
himself with the thought that in case of accident he would have been
notified by the lifting lines. The air machine was working perfectly,
too, and this indicated that all was well below.
Finally the moving object came to a position about ten yards distant
from the submarine and stopped. He was now about fifty feet below the
window out of which Jimmie looked, for the Sea Lion, as has been said,
lay well up from the bottom, not exactly over the wreck but not far
from it.
In a moment the boy saw the glimmer of a lamp down where the man was,
and saw that it was moving about on the bottom. Lights, of course, do
not show in water as they do in air, and so it was only a faint
illumination that Jimmie observed.
Still, he could see that whoever was carrying the light was fumbling
about on the bottom. He watched intently for a moment and then saw the
man coming toward him, swimming straight up.
"I guess it's one of the boys," Jimmie mused. "He must have lost his
line, and when I saw him fumbling he must have been removing the
weights designed to hold him down in spite of the air in the helmet."
This appeared to be a good explanation, and the boy stood with his
face pressed against the glass panel of the water chamber door,
waiting for whoever it was to enter, close the apartment, and push the
lever that controlled the exhaust which emptied the chamber.
At last the swimmer clambered into the chamber, and the waiting boy
was about to switch on a light when a suspicious action on the part of
the other caused him to hesitate. He could observe the actions of the
man in the water on the other side of the glass panel quite clearly
now, and was alarmed at what he saw him doing.
Instead of drawing his air-hose in with him and coiling it carefully
so as to clear the doorway and still leave free passage for the air
which was being pumped into it, he laid the hose carefully in a slide-
covered groove in the edge of the door. The hose did not seem to be
quite large enough to fill the groove, and the fellow took something
soft and pliable from a pocket and wrapped around it.
Then he closed the door and pushed the lever which released the power
that forced the water out of the chamber. Only one inference was to be
drawn from the scene which Jimmie had witnessed.
The man in the water chamber was a stranger. This was merely an
attempt to get possession of the Sea Lion.
The fellow was breathing air pumped into his hose by some other boat
than the Sea Lion. He had cast off his weights in order to gain the
chamber, which neither one of the boys would have found necessary, as
they would have been carried up by the machinery which worked the
lifting and descending lines.
Another thing the boy realized, as he waited with anxiety for the next
move. The man, whoever he was, was thoroughly familiar with the plan
of the Sea Lion.
The grooves in the edge of the door had been planned so as to give
entrance to visitors who were not receiving their air from the Sea
Lion. No one was believed to know anything about this arrangement--no
one save the builders and the Secret Service men.
While Jimmie watched, the intruder moved the lever and the water in
the chamber began to lower. When the water was forced out fresh air
was automatically forced in.
Before long the intruder disconnected his hose with his helmet and
threw the end over a hook provided for that purpose. When the water
was all out he knocked heavily on the door leading to the room where
Jimmie stood.
"There'll be doings here directly," the boy thought.
Again and again the visitor beat upon the door, but Jimmie gave no
sign. He could not well observe the man now, for, with the water out
of the chamber, the light carried by the man inside shone brightly
against the glass panel, and the boy would have been observed had he
stood close to it.
Jimmie grew more anxious as the seconds passed. He was trying to put
away the thought that the intruder had cut the air-hose attached to
the helmets of his friends.
For all he knew all three boys might be lying drowned, on the floor of
the ocean. The thought was unbearable, and he resolved to banish it in
action.
His first impulse was to disconnect the exhaust and fill the chamber
with water. The man in there had disconnected his air-hose and would
soon drown.
But the brutality of such a course soon presented itself, and Jimmie
cast about for some other method of meeting the dangerous situation.
He could hear the visitor fumbling at the door, and wondered if he
knew the secret of opening it.
After a time it seemed to the listening boy that the fellow was
feeling in the right locality for the hidden spring which would open
the door from the other side, and sprang for the bar which secured it
against such entrance. Then he dropped the bar and stood wiping the
sweat from his forehead.
"If I bar the door," he mused, "that robber will cut the air-hose
protecting the boys outside, if he has not already done so. I've just
got to let him in here an' take chances."
He hastened to the back of the room and brought a long coil of rope.
Making a running noose in one end, he released several loops from the
big coil and held them loosely in his hand.
"I wonder if I can assist him into our princely apartments?" thought
the boy, whimsically. "If I can get this rope around his body and over
his arms, I'll be the boss of the precinct! I expect he'll tumble
around a good deal, but I guess I can quell him!"
The boy waited in the darkness until a faint click told him that the
intruder had discovered the spring. This was followed by a slam as the
sliding door fell back.
Then all was still. Jimmie, hidden in the shadows, prepared to throw
his lasso as soon as the visitor left the doorway.
The man was still in the doorway, and was swinging his light about so
as to give him a better view of the room.
"If he would only drop his arms!" Jimmie mused. "I'd like to hit him
with a ballclub!"
Directly the fellow did drop his arms, and at the same moment stepped
out of the shelter of the doorway. This was what Jimmie had been
waiting for, and he lost no time in acting.
The rope cut the air and descended over the intruder's head and arms.
The lad's hours of practice while playing cowboy now proved to be of
great worth.
Jimmie gave a quick jerk as the rope landed and he ran to the back of
the room. He heard the other fall, and knew by the weight that he was
dragging him.
When he gained the wall he switched on the light and reached to a
shelf for a weapon. When he faced his captive he held an automatic
revolver in his hand.
By this time a torrent of expletives was coming through the helmet
opening where the air-hose had entered. The prisoner rolled about on
the floor, trying to get to his feet.
"Whoo-pee!" shouted the boy. "Look what one can catch out of the
ocean!"
"All right," said the boy, "then I'll take it off for you. But I'll
have this gun handy, and if you try any foolishness you won't hold
water when I get done shootin'."
Before long the helmet was off, and Jimmie was looking into as evil a
face as he had ever seen. It was the face of a stranger, and yet there
seemed something familiar about it.
"What sort of a game is this?" demanded the captive. "If you know
what's good for you, you'll quit this cowboy business."
Jimmie sat down and leveled the weapon at the struggling man.
"I guess I'd better shoot," he said, calmly. "I suppose you've cut the
boys' air-hose, and I'll have to get back to New York the best way I
can--alone. So, you see, I can't be bothered with you."
The captive ceased his struggles and managed to rise to a sitting
position. His eyes were not so threatening as before.
"That would have meant death to the boys who are out in the water at
this time?"
"I suppose so. Say, there's something wrong with your air machine. I
know something about such contrivances, and this one acts as if a hose
out in the sea had been cut!"