“do you know how high the tide rises on this island?” asked andy after a pause. his voice sounded strange in that hollow, dark place, amid the ceaseless lapping of the water on the rocks.
“how high? no, but it can’t get much higher,” answered frank as cheerfully as he could. “it’s been rising some time now, and it must stop soon.”
“it seems a long time, but it isn’t,” went on andy in that quiet voice. “look, it’s seven o’clock,” and he held out his watch, illuminating it with the flashing electric light.
“seven in the evening,” murmured frank. “it must be getting dark outside.” it had been dark from the beginning in the cave.
“seven o’clock in the evening,” went on andy, “and we came in here about four! the tide has several hours to rise yet, and—”
he did not finish, but he glanced down at the water that was steadily rising up on their legs.
it was chilling them, yet they dared not move much for fear of toppling off the narrow ledge.
frank did not answer. he was busy trying to think of some way of escape. yet, rack his brain as he did, no way out of the cave seemed possible. were they doomed to die there?
“can we climb any higher?” asked andy, after another period of silence. “if we could, we might get out of reach of the water, even when the tide is full. let’s turn on both our lights and look at the wall back of us.”
they had been saving the fast-waning current in the electric lamps against the time of need. they might have but little further use for it, so both andy and his brother pressed the springs that turned on the gleaming lights.
in the glow they could see the black and gurgling water at their knees. it was swirling around from the force of the tide outside that was rushing into the cave. though the stone thrown down by the man at the entrance prevented our heroes from escaping, the bowlder did not fit so tightly but what water could come in.
“now to see what’s back of us,” spoke frank, turning around as well as he could on the small shelf, and flashing his light on the wall behind him.
“say!” suddenly exclaimed andy, “doesn’t it strike you that the water isn’t coming in so fast as it was?”
frank held his light lower, and looked at the rising tide.
“there doesn’t seem to be quite so much force to it,” admitted the elder racer lad, “but i’m afraid that’s only because it’s higher, and because it has to wind in and out of so many passages, and force itself under and around the rock which that scoundrel threw down. i wish we had him here!”
“i guess he’s far enough off by this time,” remarked andy. “but let’s see if there’s a way to get higher up.”
together they examined the wall of the cave against which they had been leaning. frank uttered a cry of joy.
“it’s mostly dirt, not stone!” he exclaimed. “we can cut steps in it, and climb up. maybe we can get high enough so that the tide won’t reach us, or at least we can keep our heads above water until it goes down. come on, where’s your knife?”
working by turns, with the only knife available between them, the boys began frantically cutting niches or steps in the dirt wall. fortunately it was packed hard enough so that it did not crumble. they took turns at the desperate labor, one holding the torch, and the other wielding the knife.
all the while the tide kept coming higher, until it was now to their waists. but they had not yet made enough notches to enable them to stand up, clinging by their hands and toes. for it needed four niches for each lad—eight laboriously-cut holes in the wall, four niches for the hands and four for the feet, some distance apart. even when this was done it would only raise them about twenty inches. would that be enough?
“we can’t cut any more after this,” said frank dully, when they had almost finished the eight.
“why not?”
“because we can’t hold on in these and cut any more. the footing isn’t good enough. if we only had a sort of platform to stand on, we could reach up higher. as it is, i’m afraid this isn’t going to do much good—that is for very long. the water is still rising.”
“if we only had some sticks,” exclaimed andy hopelessly. “we could drive them in the dirt, leaving the ends projecting, and then we could go up, like on a ladder.”
“but we haven’t any sticks.”
“maybe there are some on the shelf where we are standing; imbedded in it.”
it was a slim chance, but worth trying, and by turns they stooped over and felt down beneath the water. this had the effect of wetting them to their shoulders, but not a piece of wood could they discover. helplessly they stared at each other in the dying gleam of their electric torches. relentlessly the water mounted higher.
“we might as well get up in the niches,” said andy, after another long pause. “we may not be able to climb if we wait too long.”
“wait as long as possible,” advised his brother in a low voice.
“why so?”
“because it’s going to be hard to cling there. it’s a stiff position to hold, and we ought to stay here, where we have a good footing, as long as possible. there’s time enough when the water gets up to our shoulders.”
it was like waiting for almost certain death, but the boys never lost their hearts. somehow they felt that there would be a way out—yet how it would come they dared not even imagine. they only hoped and—waited.
“we’d better climb up now,” said frank at length. “you go first, andy, and get a good hold. i’ll follow.”
“why don’t you go first?”
“oh, you might fall.”
“so might you.”
“go ahead, i tell you!” and frank spoke more sharply to his brother than he had ever done before. andy turned and clambered up in the niches. they had cut them slanting to give their feet and hands a better grip, and this was a wise provision, for it was desperate holding at best.
frank followed his brother, and then, at the last stand, they clung there together, listening to the lapping of the water that, raised up as they were, even now wet their legs.
how long they clung thus they did not know. it seemed a long time, but it could not have been more than fifteen minutes they agreed afterward, for the water did not gain much. but suddenly the silence of the night outside was broken by a loud report.
“signal guns!” exclaimed andy. “some vessel is in distress.”
“no, that’s thunder!” said frank. “there’s a storm coming up. but we won’t know it—in here.”
“i hope our boat is safe, and that the gull is well anchored,” went on the younger lad anxiously.
“as if that mattered,” thought frank, but he did not say so. he began to think they would never have any further use for their craft. he choked back the dreadful fear that seemed to take possession of him.
once more came a terrific clap of thunder, and it seemed to shake the very island to its center.
“it’s a fierce one,” murmured andy.
in quick succession came a number of awful reports. the earthy wall to which they were clinging seemed to tremble. the water gurgled below them, rising higher and higher.
“i wonder—” began andy, after a terrific clap, but his words were silenced in the thunderous vibration that followed. it was the hardest clap yet, and the boys felt a tingling, numbing sensation in their fingers.
“that struck near here!” yelled frank.
his face was turned upward toward the roof of the cavern. he felt something falling on his cheeks. it seemed to be particles of dirt. then he felt a dampness that was not from the waters below him. more particles fell.
“what’s the matter?” cried andy. “something is happening. what is it?”
before frank could answer, had he known what was taking place, there came a loud splash in the water at andy’s left.
“is that you frank? have you fallen?” he cried desperately.
“no, i’m here,” replied his brother. “that must have been part of the side or roof of the cave jarred off by the thunder. hold fast, andy.”
there came a second splashing sound in the water, followed by another. the drops of dampness and particles of earth continued to rain down into the faces of the lads.
“the cave’s crumbling in!” cried andy. “the roof is falling.”
“hold—” began frank.
a roar interrupted him. suddenly the cave seemed to be illuminated by a dazzling light bluish in color. by it the boys could see each other as they clung to the wall. they could see the black and swirling waters now waist high. but they could see something else.
they could look up and out through a jagged hole in the roof of the cavern, and through that opening they had a glimpse of the fury of the storm. they could see the lightning flashing in the sky.
for a moment the meaning of it was lost on them. then frank uttered a cry of hope.
“we’re saved, andy, saved! now we can crawl up out of the top of the cave and escape! the tide can’t reach us now! we’re saved!”
