Not content simply to be the choice purveyors of timepieces for the fashion-conscious urbanite, Swiss watchmakers are diving into the ocean's depths and coming up with new treasures. Breitling's Avenger Seawolf ($3,660) is a diver's watch that is water-resistant to 3,000 m, with a steel case elegant enough for a night out. Rolex's Oyster Perpetual Sea-Dweller Deepsea ($9,250) can go to the extreme depth of 3,900 m and has design elements that keep the diver in mind — the watch's stainless bracelet can be extended and worn over a neoprene diving suit.