For instance, diving pressure on the watch is clearly greater at the impact point with the water during poolside diving. Condensation can also be a problem. A sealed watch will pick up body warmth in water and this remains in the case. If the watch is then suddenly plunged into water that is some degrees colder, moisture can then be created within the watch and become visible as small droplets under the glass. This normally dissipates of its own accord once the watch is removed from the water, but this is not always the case. The watch may then need to be returned to the watchmaker for inspection.