Why is that critical? If a unidirectional bezel is knocked and accidentally moved on the dive, it may possibly only display an extended underwater time. Which means the wearer will overestimate in lieu of underestimate immersion time, and in predicaments that call for decompression stops, this can be a make-it-or-split-it https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/