Why is significant? If a unidirectional bezel is knocked and accidentally moved with a dive, it can only Exhibit an extended underwater time. Which means the wearer will overestimate as opposed to undervalue immersion time, As well as in situations that need decompression stops, This may be a make-it-or-crack-it variable https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/