dunking your head deep underwater WH

Description: Request: you are outside of the bathtub, and bathtub is completely filled with water. you start wetting your hair by dunking your head deep underwater, bent over the tub. you make several dunkings , staying under and breathholding as long as you can and going deep under. then followed by two shampoos and conditioner, which each time you rinse with several long and deep dunks. from time to time, blowing some bubbles too.