Why is that important? If a unidirectional bezel is knocked and accidentally moved on the dive, it could only Screen an extended underwater time. Which means the wearer will overestimate as opposed to underestimate immersion time, and in scenarios that call for decompression stops, this can be a make-it-or-crack-it variable https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/