The Underground is an extension of the Nightgallery, and is located downstairs from the Thunderdome. The music which is identical to the Nightgallery ranges from Progressive House, Hard House, and Breaks to beautiful Trance and upbeat Jungle spun by reigning resident and crowd favorite DJ J-Me.

The atmosphere is cool and dark. Gothic art dots the walls, and it is a favorite of people who like to stay out of the light. Often all you can make out in the Underground is swirling glowsticks, which patrons love to dance with. The Underground is a must see for any techno music connoisseur.