Final answer:
When assisting an unresponsive, non-breathing adult victim, the first priority is to remove the person from any water or hazardous environment and bring them to stable ground. CPR should be performed on stable ground using chest compressions and rescue breaths. Proper training is essential to minimize the risk of further harm to the patient.
Step-by-step explanation:
When assisting an unresponsive, non-breathing adult victim, the first priority is to remove the person from any water or hazardous environment. CPR is ineffective in the water, so bringing the person to stable ground as quickly as possible is crucial. Once on stable ground, start CPR by performing chest compressions and rescue breaths. It's important to receive proper training in CPR to ensure it is performed correctly and to minimize the risk of causing further harm to the patient.