Thank your examiners.
Take some deep breaths.
Make a few notes about what just happened.
Make sure your supervisors know what just happened.
Call whoever you need to and let them know.
Take some more deep breaths.
Go find a way to celebrate.
And in and among all of those moments, have a minute for yourself to really take in what you’ve achieved in the viva. The almost-end of a long, long period of hard work and discovery. Don’t forget that it wouldn’t have been possible but for you.
You deserve every congratulation you receive.