Oh wow. Sorry. In IP68 devices, prolonged exposure and deep diving aren't advised. Also, in waterproof devices generally, it is possible for seals to degrade over time. I don't know exactly what happened in your case.
Please let us know what the authorised service centre says. It will be helpful for the community to learn. I use a Watch 6 Classic myself. Sorry about this.
I didn't dive it. Not more than five minutes. I was playing my little girl less than five minutes in the water and noticed the screen yellowing and then the ripple in the screen and then the watch closing To be referred. Sounds and the screen is black. You completely destroyed me. 😂
