Q says "Rig for red" and "Silent running" Rig for red: Used in submarines, to ensure all interior lighting is red and of low intensity so as to preserve night vision. This is the call to turn the control center lights to red in preparation for PD (periscope depth). Silent running Silent running is a tactic used when...  The writer of the song, "Silent Running" above says what the song is about Tweet by POTUS: Light years... time.