Although dive watches are designed to be waterproof, they are not resistant to wear and tear which can compromise their waterproof abilities. Here are a few things you can do if water gets inside of your waterproof dive watch.
Sunlight & Towel Method
If there is just a little bit of water inside of your dive watch, this method may work. It is really easy to do and will not harm your watch in any way. All you need to do is find a safe place where you can set your watch out in the sunshine. This method will not work well on a cold or cloudy day.
Set your watch in the sunshine and place a towel under the watch, preferable one that is highly absorbent such as a micro fiber cloth. The cloth will absorb any moisture that is evaporated or drains out of the watch as it sits in the sun. The sunshine will help evaporate the water inside of your watch.
Rice Bowl Method
Although this trick is often used on cell phones, it can also potentially work with your dive watch. You will need a bowl full of uncooked, dry rice. Put some rice in a bowl, then place your watch inside of the bowl, and pour additional rice on top of your dive watch.
Let your watch sit inside of the rice bowl for a day or two, preferable in a warm room. The warmth of the room should draw out the water from your dive watch, and the rice will absorb the water.
If you have the right tools, you can even take off the face or back of your watch and place it in the rice bowl. The rice should absorb any water that is inside of your dive watch. Once all the water is gone, you can reattach the face or back of your watch.
Hair Dryer Method
Finally, you can use a hair dryer to remove the water from your watch. You are not going to want to get your watch too warm; if you heat it up too much you could risk melting the components inside of your watch.
Set the hair dryer to the low or room temperature setting, and keep it a few inches away from your watch while pointing the dryer at the face of your watch. The hair dryer should help push the water out of your dive watch.
Try one or more of the methods above if you ever get water inside of your dive watch. If these at-home methods do not work, take your watch into your local jewelry store, such as Imperial Fine Jewellers Ltd jeweller, and see if they can remove the water and restore the waterproof functionality of your watch that may have become compromised due to normal wear and tear.