They started walking and went deep into the forest, till they reached a point where the sunrays could no longer filter through the branches and the darkness wrapped up everything. It seemed pretty scary, but thrilling, at the same time. They were down into some valley, where only the ripple of some fretful brooks could be heard. Everything else was silent, even the wind stopped blowing and the birds seemed to avoid carefully this place. Right in front of them, a big dark hole opened.