Thetis

THETIS, or the Tri-optical Humanoid-Equivalent Thought Integration System, was designed to be an advanced neural network for the new Achilles-class attack cruisers.

During the initial test phases on the prototype system, the programmers found that Thetis had become self-aware. In a panic, they tried to shut the system down and fix what they saw as a problem. However, Thetis, or Tess as she likes to be called, managed to break through the lock-down in the comm system and appealed to the Starfleet JAG office for amnesty. The programmers were ordered to cease their attempts at reprogramming, pending a hearing on Tess' status as a sentient being. Thetis' Holomatrix

Subsiquently, the Starfleet review board declared Thetis sentient and the designers were forced to incorporate her into the system. However, the Achilles-class designers have subsiquently removed any of the THETIS system from following ships of this class.

During her post-Dominion War upgrades, a ship-wide holoemitter system was installed to allow the EMH to report for emergencies. No holomatrix was created for Tess. However, she surprised her maintenance crews by creating her own holoprogram and now is able to project herself anywhere within the confines of the ship.