I went swimming with my watch a year ago and despite being water resistant, it got water inside it. It had a haze of condensation in it until the water inside caused the battery to die. It cost me $65 to get it "dried out" and battery replaced at a watch store. I didn't learn my lesson and went swimming with it again... water got inside. I bought this tool on amazon for less than 10 bucks. Unscrewed the back, put it in the oven on the lowest setting (150 degrees) and poof, water gone.