The Escape of the Notorious Sir William Heans by William Gosse Hay

Sir William hardly allowed them an hour for counsel and preparation, pushing off immediately with the old woman in the lead. From the forest into which they now delved, as a man slides under the sea in a diver's helmet, they never emerged till they stood, yet in its serried trees, on the brink of the cliffs of Waterfall Bay. The tree-fern, musk-plant, brush, and lofty timber shut them from all prospect of the outer world as entirely as if they had remained in the gullies, rather than struggled and cut their way up "hill upon hill, alp upon alp, " till, unknown to Heans, the top of the main ridge had been scaled.

After that, though descent became rather more than ascent the order of these hidden places, Heans, from his own account, seems to have seen the eastern sea but a half a dozen times, and at these as a vagueness hanging on the tops of trees indistinguishable from the sky.