Suliban helix

From Memory Alpha, the free Star Trek reference.

A Suliban Helix was a massive spiral-shaped space station used by the Suliban Cabal. It was formed by combining of hundreds of Suliban cell ships around a central core. It was capable of housing at least 3000 personnel.

Enterprise discovered one located in a class seven gas giant while searching for Klaang the Klingon. Located aboard the Helix was a chamber used by Silik for communicating with his master from the future. The Helix's cell ships were separated once the polarity of the helix' maglocks was reversed by Captain Jonathan Archer. (ENT: "Broken Bow")

Another Helix was later found in a deep red nebula near Paraagan II. It was from here that the Suliban mission to destroy the Paraagan mining colony was planned. After being captured by the Suliban in March 2152, Enterprise was taken to this Helix, though it later escaped. (ENT: "Shockwave, Part II")