Outer ring of the bezel:
diving time in minutesinner ring of thebezel (orange): Immersion depth in meters
Assuming that your deepest diving depth on your underwater journey is 30 meters, align the bezel LLT of the outer ring with the minute hand at the beginning of your dive. While the outer ring of the bezel serves as a reminder to prevent your dive time limit from being exceeded - the inner ring indicates that your zero time limit is 25 minutes at e.g. 30 meters.