In professional diving, pressure is not just a metaphor - it's 1000 kilos a cubic meter. A watch that can withstand this crushing force, not to 50, or 100 but to 500 meters under water, is no more an"accessory"than a diving mask or an oxygen tank. It is essential for checking elapsed time and timing safety stops during ascent. The first Chronograph in the Aquaracer 500M series, this model is robust, its fully functional design addressing specific demands - great visibility and easy handling under water, extreme resilience and safety features you can count on even in extreme conditions.