iPhone 13 Face ID after submerged briefly into the water

Try a Forced Restart on the phone. Follow the instructions very carefully, as this is a bit tricky. You may need to repeat this several times.

Force restart iPhone - Apple Support

There are only 2 possible results when you perform a Forced Restart:

1) The phone returns to normal operation

Or, if it doesn't.......

2) There is a hardware problem with the phone that will need attention at the Apple Store (make an appointment) or take the phone to an authorized Apple Service shop.

You can find a list of authorized service shops in your area using the link just below:

Find Locations

You broke your phone.

Water damage is not covered by any warranty.

Contact Apple, have your phone evaluated and see how much it’s going to cost you to fix it.

fariskmrdn Said:

"iPhone 13 Face ID after submerged briefly into the water: But the face id itself not working. I have checked the settings, the settings for the Face ID is not disabled (i am judging that the sensor is working) but the face id does not scan/detect my face."

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Extracting Water:

Take this to a local retailer. Many retailers have devices designed to extract water from a mobile phone. Local one in my rural area do, and I've used one myself.