"Now let us look at your rocks again. Why, man, there is not water enough to float a boat between them and the shore, much less the Lido, which draws nine foot of water now she is loaded."
"I don't know, Matteo. Looking down on water from a height is very deceiving. If it is clear and transparent, there is nothing to enable you to judge its depth. At any rate it is worth trying. Before we go down, we will cut some long stiff rods with which we can measure the depth. But we have first to find a place where we can get down to the water."
After a quarter of an hour's search, they found a point where the descent seemed practicable. A little stream had worn a deep fissure in the face of the rock. Shrubs and bushes had grown up in the crevices and afforded a hold for the hands, and there appeared no great difficulty in getting down. Before starting they cut three stiff slender rods twelve feet in length. They then set to work to make the descent. It was by no means difficult, and in a few minutes they stood by the edge of the water.
"It is a great advantage, the path being so easy," Francis said, "for in case they did discover the ship we could land and climb to the top before they had time to come to shore, and once there we could keep the whole force in those galleys at bay. Now for the main point, the depth of the water."
Matteo shook his head.
"It is useless to take the trouble to undress, Francis," he said, as the latter threw off his jacket. "Giuseppi can wade out to the rocks without wetting his knees."
"Giuseppi can try if he likes," Francis said, "but I will wager he will not get far."
Giuseppi, as convinced as Matteo of the shallowness of the water, stepped into it, but was surprised to find that, before he had gone many paces, the water was up to his waist.
"Well, I wouldn't have believed it if I hadn't seen it," Matteo said when he returned, "but I think he must have got into a deep hole among the rocks. However, we shall soon see," and he too began to undress.
In a few minutes the three lads were swimming out towards the rocks which, as Francis had anticipated, rose from twenty to thirty feet above the level of the sea. The water deepened fast, and for the last thirty or forty yards, they were unable to touch the bottom, even when thrusting down their rods to the fullest depth. They then tried the depth in the passages at the end of the rocks, and found that there was ample water for the Lido. When they ascertained this to their satisfaction they swam back to the shore.