I don't know about swimming it underwater, but I just got an Enticer Wet One aluminum in a composite pot for hunting on rainy and wet days. I was pleasantly surprised as it sounded good enough to hunt with on sunny days. Al Holbert, owner of the company, also offers the same call in glass and slate, as well as a Corian pot in aluminum and glass. I picked up a Woods Wise Wet Stick on ebay for less than $10 shipped and it sounds great on the Wet One aluminum pot. That combo will surely be in my vest on those foul weather days. Google Enticer Turkey Calls and give Al a call. He will run calls over the phone for you and can let you know how wet they can get and still play. He is probably at the Harrisburg PA show this week, so it might take a few days to get him. All his pot calls he ran for me were pure turkey.