Why is the fact significant? If a unidirectional bezel is knocked and accidentally moved on a dive, it could possibly only Show an extended underwater time. Meaning the wearer will overestimate rather then undervalue immersion time, As well as in cases that need decompression stops, This may be a make-it-or-break-it https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/