Emergency Medical Hologram - Mark IV (E.M.H. IV)
From UFStarfleet LCARS
After the failed hijacking attempt of the USS Prometheus in 2374, the Prometheus class starship was equipped with the experimental Emergency Command Hologram that in the event of the ships crew being immobilised, the ship would automatically activate the ECH to take control of the ship and bring it safely back to a UFS facilty. The CMH may also, but only when absolutely necessary, destroy the ship.