Why is the fact that crucial? If a unidirectional bezel is knocked and unintentionally moved on the dive, it can only Show an extended underwater time. Which means the wearer will overestimate rather than undervalue immersion time, and in cases that call for decompression stops, this can be a make-it-or-break-it https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/