All Alpina watches nowadays are water resistant at least up to 3 ATM. Please note that the crown should always be fully screwed-in or in the rest position (fully pressed-in against the case) to ensure that the watch is water resistant. If the crown is un-screwed and pulled under water, you run the risk that water will enter into the watch! Your Alpina watch is made water resistance by sealing the caseback and crown with rubber O-rings. As a general rule, these rubber O-rings should be checked every three years by an authorized Alpina Service Center. 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 not always the case. The watch may then need to be returned to the watchmaker for inspection.