Answer:
Re-tilt the victim's head and then attempt another ventilation.
Step-by-step explanation:
In the process of providing care to a patient who drowned, after checking for his heart beat and performing ventilation and CPR, if the chest does not rise on doing these, the next thing to do is simply to repeat the process again, but this time ensure that the head of the victim is re-tilt in order to ensure effectively of the ventilation and CPR.