If anyone is unconscious follow these seven steps
Make sure the area is safe for everyone.
Ask for their response (eg.) "can you hear me? Squeeze my hands."
Send for help:
Call '000' or ask someone else to call.
Open their mouth to see if any foreign material is present, place them in the recovery position and clear their airway with fingers.
Check if they're breathing- look, listen feel and if they're not breathing then start
Do 30 chest compressions and 2 breaths also continue until help arrives or they recover.
Apply a defibrillator if its available and follow voice prompts.