Final answer:
If a missile hazard light comes on with a live missile and GM cables connected location, immediate action must be taken for safety.
Step-by-step explanation:
If one missile hazard light comes on and a live missile is present with GM cables connected location (as indicated by a light), you must take immediate action to ensure the safety of yourself and others.
The first step is to follow the established protocols and procedures in your specific situation. This may involve notifying the proper authorities, such as bomb disposal experts or military personnel, depending on the context of the scenario.
It is crucial to evacuate the area and maintain a safe distance until the situation has been resolved and deemed safe.