Why is always that crucial? If a unidirectional bezel is knocked and unintentionally moved over a dive, it could only display an extended underwater time. That means the wearer will overestimate as an alternative to underestimate immersion time, and in conditions that require decompression stops, This may be a make-it-or-split-it https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/