Why is important? If a unidirectional bezel is knocked and accidentally moved with a dive, it may possibly only Show an extended underwater time. Meaning the wearer will overestimate rather then underestimate immersion time, As well as in cases that demand decompression stops, this can be a make-it-or-crack-it variable that https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/