Not to worry. I took a genunie Breitling into a spa without screwing down the crown. When I got out there was fog on the inside of the crystal. I took it to the jeweler and he told me to unscew the crown all the way and set it aside and it will equalize to the humity of the outside air. DO NOT HEAT IT UP. The fogged inside crystal went away in a day or two. I did that over a year ago and it has been running fine since.