The Tunnels of Set, as canonically defined by Kenneth Grant in Nightside of Eden (1977), constitute the nightside or averse counterpart to the 22 paths of the Qabalistic Tree of Life.
They form what Grant explicitly terms "a dark web or nocturnal network of paths," the "counterparts" to the "well-lit highways of Horus" that link the Sephiroth to human consciousness. These tunnels "turn and twist like a serpent" and are accessed only by projecting consciousness through Daath: the "Gate of the Abyss," "Pylon of Choronzon," and "black hole" or gateway to a parallel universe of non-being (Universe B or the Meon).
Grant describes the Sephiroth as globes rather than flat discs, causing the paths to "deepen accordingly and appear… as tunnels boring deeply into space," rooted in "the inner and mystical voids of multidimensional consciousness." The entire structure is a "web-like network" resembling a "worm hole" that begins at Malkuth and ends at Kether, transmitting the "Plutonian Current… through the t