Apple Watch not working after swimming in the sea

I when’t swimming with my Appel watch on water mode the I got out to take it off I ejected the water then I died. When I got home I put it on charge I got really hot and now it won’t switch on

From Oakley Reynolds

A series 6 watch is a couple of years old. You may have damaged the watch's water seals at some point before swimming with the watch. Water damage is not covered by Apple's warranty. A series 6 is also likely out-of-warranty at this point. You can confirm this at an Apple Genius Bar or an Apple Authorized repair shop.

M1 Mac mini, macOS 13.4;  Watch, series 7 GPS/cellular, watchOS 9.5; iPad Pro 2nd Gen, iPadOS 16.5; iPhone 12 Pro, iOS 16.5; TV 4th Gen, tvOS 16.5; HomePods, audioOS 16.5 and Airport Express w/ Airplay 2

We can't help you here. Take your watch to an Apple store or Apple authorized service provider for examination and diagnosis. Apple watches (as well as every other brands of digital watches) are water resistant, not waterproof.