Hi, I am A. Stevens here to help with your question!
The last hope would be to put the camera in a bag of rice
and let it try to draw the water out for a few days
If that does not revive it, I'm afraid that yes it is beyond repair.
I hope I was able to help you today. If you are satisfied with my answer, rating my answer with positive feedback with the smiley faces below would be greatly appreciated. If you do have any additional questions please do feel free to post them here. Thank you for using Just Answer! Have a Great Day!