Some people think that the Mediterranean has risen, and that once the water in this grotto was much lower, so that boats could sail in and out of it quite easily.

Do you see that landing-place over there?
It leads to some broken steps and a blocked-up passage that tradition says wound up through the cliff right to the villa of Tiberius.

Perhaps it was a secret way by which he thought he might escape if danger threatened him." "How I'd love to explore it," sighed Irene.
"It only goes a little way before it is blocked.

It's hardly worth landing to look at it.

Be careful, Renie! If you lean over the edge of the boat so far you'll be upsetting us, and, although we might look very delightful and silvery objects under the water, I'm not at all anxious to offer myself for the experiment." "Why don't they enlarge the entrance ?" asked Vincent.
"Because nobody is sure whether by doing so they might or might not spoil the beautiful effect of blue light in the grotto.