The labyrinth is thoroughly known.

"We have not even to risk the adventure alone for the heroes of all time have gone before us; the labyrinth is thoroughly known. We have only to follow the thread of the hero path; and where we had thought to find an abomination, we shall find a god; and where we had thought to slay another, we shall slay ourselves; and where we had thought to travel outward, we shall come to the center of our own existence; and where we had thought to be alone, we shall be with all the world."

~Joseph Campbell