Type: Alien world
Environment: Earthlike
Usual Means of Access: Magic
Dominant Lifeform: Various humanoid species
Prominent Inhabitants: Aeroika, Ytitnedion, Xhoohx

Comments: Tunnelworld is a realm in which outer space appears to be solid and the inhabitable surfaces are long tunnels snaking through the solid matter. Tunnelworld was threatened by the magic of an evil entity known as the "Unnamable" until the combined might of the Defenders defeated him.

First Appearance: DEFENDERS #71