Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.
I'm sorry to hear that. If the unit is damaged, I would not suggest that you submerge the phone with water since we cannot guarantee that it meets the requirements with the IP-class.
I suggest that you visit nearest service center to have your phone examined and fixed by a technician. You can contact your local support team for further information about nearest service center and/or how to proceed with this in the best possible way:
http://support.sonymobile.com/global-en/contactUs/
