From Seiko watches to Omega all the major watch brands offer a range of water resistant watches. When buying this type of watch it is important to check out the back of the watch, as the depth the watch can go too should be stamped on the back.
Some watches are suitable for swimming whereas other watches can be used at great depths. To prevent water seeping in these watches, a special water resistant sealant is required to fill in any cracks. The back of the watch needs to be screwed in as opposed to pushed in like regular watches to create a better seal.
Water resistant watches require regular maintenance by specialist watch repairers. Batteries need to be looked at regularly and sealant needs to be checked to ensure there is no water leakage. Any broken sealant needs to changed or repaired immediately to prevent any damage to the watch mechanism.