They were over what seemed a natural cave in the rock, to which apparently the river had access, for, at a great distance below, a faint light was gleaming upon water.

If they could but reach it, they might get out; but even if it was deep enough, the height was very dangerous.

The first thing, whatever might follow, was to make the hole larger.

It was comparatively easy to break away the sides of it, and in the course of another hour he had it large enough to get through.
And now he must reconnoitre.

He took the rope they had tied him with--for Curdie's hindrances were always his furtherance--and fastened one end of it by a slipknot round the handle of his pickaxes then dropped the other end through, and laid the pickaxe so that, when he was through himself, and hanging on the edge, he could place it across the hole to support him on the rope.