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The Tactical Cube is the Borg’s Class 4 Tactical Vessel. It is a more heavily armored version of a Borg Cube.
Captain Kathryn Janeway of the U.S.S. Voyager, along with B’Elanna Torres and Tuvok, transported onto Tactical Cube 138 and planted a nano virus into its central plexus. The virus would allow the drones in Unimatrix Zero to retain their memories and break free from the Collective.
After a brief skirmish with Voyager and a renegade Borg Sphere, the Borg Queen attempted to thwart the nano virus by initiating the Tactical Cube’s self destruct sequence