Why is the fact critical? If a unidirectional bezel is knocked and accidentally moved on the dive, it may possibly only Display screen an extended underwater time. Meaning the wearer will overestimate instead of undervalue immersion time, and in scenarios that involve decompression stops, this can be a make-it-or-crack-it element https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/