One of the most divery divers out there... this over-the-top Aquatimer has the guy covered who has some major timing to do! The IWC reference IW3723 features three different ways to measure elapsed time.
1. Rotating an Inner Bezel by way of twisting the pusher at the 4 o'clock subdial.
2. A 12 hour Chronograph
3. A "Split Minute" complication whereby toggling the trigger at the 8 o'clock position freezes the black and yellow hand in place (seen in the photos frozen at the 23 minute mark). As the minute hand travels away from the frozen hand the user can measure the elapsed time between the two hands. Toggling the trigger at 9 o'clock will send the black and yellow hand back underneath the minute hand.
Few watches in my mind have a cooler Dive vibe than this. Though complicated, it maintains a super high level of legibility and is very well lumed for night time activities. The titanium case and bracelet make for an enjoyable wearing experience despite the generous proportions of 44mm x 16.3mm. Links provided can easily accommodate a 7.5"+ wrist.
