While it was not possible that those who had stolen the Bonita could gain possession of the tug so long as her crew exercised ordinary care, nor probable that they would make any very desperate effort to do so in her disabled condition, every precaution was taken for the defense of the steamer and the safety of the treasure.

Immediately after breakfast Bob, Joe and Harry went into the hold, and the work of stowing the bags among the ballast where it would escape observation was begun.

The gravel and rocks were first dug away until the keelson was exposed, and on this timber the gold was packed, after which everything was replaced as before, leaving the bags buried to the depth of six or eight inches. The hoard was thus hidden so securely that there was little chance that it would be found unless the searchers had positive information of its being on board.

This work was hardly finished when Walter came below with the information that the two men were leaving the key, and Bob and Joe hurried on deck, for it was by no means certain some demonstrations against the steamer would not be made.

In this, however, they were happily mistaken. Neither he with the red nose nor the Mexican had any idea of trusting their precious bodies within reach of possible harm; but they stopped the boat fifty or sixty yards away while the leader shouted:

"Do you still say that you won't lift a hand toward helpin' the brig off the shoal?"

"There's nothin' we're able to do," Bob replied. "The tug is as useless as a raft, an' it'll be three weeks at the very soonest before the screw can be turned. I'm willin', though, to say we wouldn't help you if we could, so it's no use to do any chinnin'!"

The red-nosed man appeared to think that some vent for his anger was absolutely necessary, and he catered to this feeling by shaking his fist threateningly, after which the two rowed out of the cove.

"I don't reckon them kind of monkey-shines will do us much harm," Bob said philosophically as he walked slowly aft to where Joe had recommenced his long task of repairing the engine, as if time was too precious to be wasted on such villains as those in the boat.

"If they're wise we sha'n't see so much as their noses again," the engineer said. "This craft wouldn't be of any service if we should offer to give her up, and the scoundrels ought to be in too much of a hurry to leave the vicinity, where the schooner from Nassau may put in at any moment, to waste much time on spite-work!"

"I reckon you're about right; but at the same time, it stands us in hand to be ready if they should take it into their ugly heads to kick up a row. After we've made sure they're really gone I'll take two of the boys ashore an' bring off a cask of water. It's got to be done before we can leave, an' now's as good a time as any."

There was nothing the remainder of the crew could do to help Joe, however disposed they might be for the task, and he made no objection to the plan.

The yawl was lowered, an empty cask put on board, and, with Harry in the stern-sheets, Bob and Jim pulled the little craft out toward the open water until it was possible to see the enemy fully a mile away as they rowed around the key.

"We're all right now," Bob said after one glance at the two men. "There's no chance of them villains getting back before we fill the cask; so head her for the shore, lad."

It was a difficult job to get the water-butt, after it had been filled, from the spring to the boat, and the forenoon was well-nigh spent when the task had been accomplished. The only thing in the laborers' favor was the fact that the sun no longer sent down such fervent rays upon the parched land. At about ten o'clock clouds began to gather, and had continued to do so until the entire heavens were covered as by a veil, much to Bob's disquietude.

"There's more than rain in them, lads," he said with an ominous shake of the head when they emerged from the thicket with the unwieldy burden. "If I ain't 'way out of my reckonin' we'll get a capful of wind from the east before mornin', an' the Sea Bird stands a slim chance of keepin' off the shore."

"With both anchors down I don't see how any harm can come to her, no matter how much of a gale we have," Harry replied as he gazed toward the trim little steamer, which was moored so securely bow and stern.

"I'm afeared you'll have a chance of seein' how it can be done. This sandy bottom ain't the best holdin'-ground for an anchor, an' once she begins to drag nothin' can stop her. Howsomever," he added in a more cheerful tone, "we needn't croak till the trouble comes; but it's best to get aboard lively an' make preparations for a dirty night. It won't take much of a wind to knock the brig to pieces if she's on the outer edge of the shoal, so we can reckon on that red-nosed villain an' his mates comin' ashore about sunset."

It was necessary for the rowers to exert all their skill and strength on the oars to prevent the yawl from being swamped during the return to the steamer. Already had the sea begun to rise, and the white-capped waves which now beat heavily against the shore gave token of what force they would exert when roused to fury by the east wind, which was causing the trees to wave helplessly to and fro against the gray sky.

The little boat was loaded to the gunwales, and despite every effort the green water rushed in over the rail very often, much to Harry's alarm. By pulling around to the starboard bow of the steamer, where they would be partially sheltered from both wind and wave, it was possible to get the heavy cask on board without mishap, after which the yawl was hooked on the falls and hoisted up; otherwise she would speedily have been stove to pieces against the larger craft.

"It looks as if we were to have a bad night," Joe said when the work was finished and all hands went aft once more.

"The worst we could have," Bob replied gloomily. "The chances are the steamer will be driven ashore, and there's no question about those villains leaving the brig; so unless this wind takes a different slant before sunset we can count on bein' penned up on the island with them as jolly companions. But we can't afford to moon 'round very long tellin' what's goin' to happen, for there's plenty of work to be done. The awnin' must be taken down an' the cables overhauled."

Then he called for the boys to "bear a hand," and soon all were busily preparing for what was apparently the inevitable.

By the time the deck had been cleared and everything made snug the Sea Bird was dancing about like a cork, flinging the spray fore and aft as she came up on the cables with a thud that caused the timbers to creak, or plunging her bow under until the deck was awash.

At five o'clock in the afternoon the gale was full upon them, coming directly out of the east, and so furiously did the little craft toss and pitch that Bob took the precaution of stretching life-lines fore and aft. The cables had been slackened to give plenty of scope; but she overrode the bow anchor until one would have fancied, from the savage jerks which the steamer gave, that it had been hove short.

There was no thought of cooking. Jim could hardly have remained on his feet in the galley, for the swell was shorter and more violent than it would have been on the open ocean; therefore the anxious ones were forced to eat dry ship's-biscuit with the poor consolation in mind that before morning all their stores might be at the bottom of the sea.

The boys were in the pilot-house, where they could have a view of all that was going on and yet be in a position to render immediate assistance if it was needed. Joe and Bob remained on deck despite the spray which fell like rain; and the former said to the old sailor toward night, as he made his way forward after great difficulty:

"We can get some pleasure out of the fact that the men haven't come ashore from the brig. There's no chance of their making harbor in the teeth of this wind, and we can count on having got rid of them."

"That's where you make a mistake, my hearty. They most likely landed two or three hours ago, runnin' down the western shore, where they'd find sheltered water. Them men ain't fools if they are villains, an' by noon knowed the brig couldn't hold together much longer. The chances are she was bilged two hours ago, an' has gone to pieces by this time."

Joe went aft again, looking more disconsolate than ever. He had felt positive the enemy had not abandoned the vessel, and his disappointment was all the greater because this hope had been so strong.

When the gray light of day gave place to the darkness of night the anchors still held; but the steamer was laboring so much on account of the bow hawser that Bob decided it would be necessary to shift the strain, despite the danger attendant upon such an undertaking.

"All hands on deck!" he shouted at the door of the pilot-house, adding warningly, as the boys crept out, "keep a firm hold of the life-lines, lads, for he who falls overboard will stand a poor chance of saving himself."

To make the proposed change it was necessary to carry the cable astern after it was cast off the bitt, for all the slack had long since been let out, and rapidity of movement was as essential as strength.

"Wait till she buries her nose once more, an' then rush when she rises," Bob shouted as he threw off two or three turns of the rope.

Up, up the little craft rose as the great green waves swept beneath, and then when the hawser chucked her and the fall began, the signal was given:

"All hands with a will now!" the old sailor shouted; and in an instant the crew were rushing madly aft, the heavy cable nearly dragging them from their feet.

Bob had been correct as to the precise time when this maneuver should be executed; but he failed to give due consideration to the force the under-tow would exert in such shoal water. The hawser had but just been loosened from the bitt when the drag of the waters began. All hands clung with a force born of desperation; but their efforts were vain.

A crew of giants could not have resisted the strain upon the wet, iron-like rope, and Bob shouted wildly when he was almost at the taffrail:

"Let go! For your lives let go!"

Fortunately this order was obeyed before any one had been injured in the rush, and as the hawser disappeared over the stern Joe muttered half to himself, but so loud that Harry could distinguish the words:

"We've done all we could to wreck the little craft. It would have been better to let her labor with the risk of chafing the rope apart, rather than deliberately throw one anchor away when two hardly held her!"