Why is always that critical? If a unidirectional bezel is knocked and accidentally moved over a dive, it may possibly only display an extended underwater time. Meaning the wearer will overestimate rather then underestimate immersion time, and in situations that require decompression stops, This may be a make-it-or-crack-it factor that https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/