Sure you can, but I would suggest against it. There have been many posts on this board about the watch getting wet and malfunctioning afterward even though it is supposed to have ip68 water resistance.
Thank you for reaching out and welcome to the community. This is such a wonderful question, and I would be happy to assist you further. After using the watch in seawater, rinse it in fresh water and dry it. Failure to do this as instructed may cause the watch to suffer from operability or cosmetic issues. Give this link a try for more information and tips on the water resistance of our Samsung Galaxy watch series devices: https://www.samsung.com/us/support/answer/ANS00078031/
