From Star Trek Online Wiki
Of interest to raiding Klingon forces is an asteroid field in the Tazi System, whose larger members have active magma chambers. They're also partially covered by semi-fluid lava and mask tetryon emissions.
A class O world, Tazi is home to approximately 4.6 million inhabitants. The Tazani government permitted a Federation research station to be launched into orbit in 2396, and the close cooperation between the crew there and the Tazani Science Ministry is believed to be one of the key factors that prompted the Tazani to petition for Federation membership in 2408. The application is pending.
- “Tazi System Patrol”: In 2409, Klingon squads hid near the larger asteroids. Although these masked the tetryon emissions of the intruders, the starbase crew was aware of their presence and asked you to drive them out. After destroying all Klingon Empire ships the geologists went to resume their operations.