(coexisting on another dimensional plane)
In 2155, T'Pol enlisted Soval's help to rebel against the Empire. Soval was at first reluctant to get involved, saying he was too old to be a revolutionary. When Commander Archer made an impassioned speech regarding the future of the Empire and expelled all aliens from the USS Defiant to Avenger, Soval realized something had to be done. With T'Pol, he enlisted Phlox's aid to disable the engine and weapon systems on board the Defiant so Avenger could destroy it.
Now in command of Avenger, Soval ordered her on a strafing run of the disabled ship. Unfortunately, Defiant restored its systems and destroyed Avenger with all hands, including Soval. (ENT: "In a Mirror, Darkly, Part II")