Why is always that essential? If a unidirectional bezel is knocked and unintentionally moved on the dive, it can only Screen an extended underwater time. Meaning the wearer will overestimate rather than underestimate immersion time, As well as in scenarios that need decompression stops, this can be a make-it-or-crack-it component https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/