The next five minutes were occupied in reaching the deck with their burden. Upon feeling the salt sea breath the three breathed easier, while they glanced about to see if the way was clear. As Francisco had prophesied, the night was quite dark, though there were signs in the west that the clouds were breaking away. No one was to be seen nearby, and silently the three stole along toward the place where they expected to meet Francisco, bearing the chest containing the instruments, charts and papers of the young engineers. Fortunately, this was small, as they had not taken more than was necessary.

Harrie and Ronie bore this between them, while Jack followed with every sense strained to catch the first sight or hear the first movement of their enemies. In this way they had passed half the distance, and had caught a glimpse of one ahead whom they believed to be their friend, when a sharp voice rang out an alarm that for a moment fairly took away their breath. Before they had fairly recovered the cry was answered from the fore part of the vessel, and they realized that their flight had been discovered.

"Quick, señors!" called Francisco. "In a moment we shall be too late."

Ronie and Harrie quickened their advance, while Jack prepared to meet the enemy hand-to-hand, if it should be necessary, while he kept close beside his companions.

"The boat is ready," said Francisco. "Let me fasten the rope about the chest. If we can lower that before they get here, we will give them the slip."

Already they could hear the crew of the Libertador rushing wildly about, uttering confusing cries, which told that they had little idea of what was taking place, the majority doubtless thinking they had been attacked by some unknown and mysterious foes. Above this medley of voices rang the stern command of the captain, trying to bring order out of the excitement.

Francisco had now arranged the rope about the chest, and then it was lowered down the ship's side, rapidly, hand over hand.

"They are coming!" exclaimed Jack, hoarsely. "If I only had a weapon of some kind I would show them the mettle of my arm."

"Over the rail!" said Francisco, and he and Harrie shot down the line at a furious rate. But before Ronie and Jack could follow they found their retreat cut off, and themselves confronted by a dozen armed men, with others coming swiftly toward the scene.