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.
"I shall believe you in future, Francis, even if you assert that the moon is made of cheese.

I could have taken an oath that there was not a foot of water between those rocks and the shore." "I hardly ventured to hope that it was as deep as it is," Francis said, "but I know how deceiving clear water is, when you look down upon it from a height.