Nyrian biosphere vessel

From Memory Alpha, the free Star Trek reference

The Nyrian biosphere vessel was a vast starship utilized by the Nyrians of the Delta Quadrant.

The ship was equipped with a translocation device and acted as the prison where they keep the crews of ships, space stations and colonies that they have acquired.

The ship contains 94 holographic habitats, each tailored to make the stay of the prisoners as comfortable as possible. Habitats can be entered from the main body of the ship via hidden portals. These portals also link one habitat to another. The habitats are individually named, including Argala, Bourget and Zooabud.

The ship was shut down in late 2373 when the crew of the USS Voyager escaped and captured several high ranking Nyrians in the Argala habitat. They left the ship under the control of the other prisoners and disabled the translocater. (VOY: "Displaced")