He whispers it into his universal translator. Who takes off a prisoner's universal translator? They're single-purpose gadgets, and so essential for quality of life.
The robotic voice on the bridge is pleasant, obsequious, gently feminine.
DESTRUCT SEQUENCE COMPLETED AND ENGAGED
DESTRUCT SEQUENCE IS ACTIVATED
WARNING: SELF-DESTRUCT SEQUENCE HAS BEEN INITIATED. WARP CORE OVERLOAD IN TWENTY MINUTES.
The other voices on the bridge, beginning to shout, are less pleasant.
All over the ship, the red emergency light strips along the walls begin to flash on and off. Sirens wail. In half the hallways, sprinklers turn on.
The forcefield over Jean's cell winks out, and he takes off at a run.