Why is that important? If a unidirectional bezel is knocked and accidentally moved with a dive, it may only Exhibit an extended underwater time. Which means the wearer will overestimate rather then underestimate immersion time, As well as in situations that call for decompression stops, This may be a make-it-or-break-it https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/