Tudor
The Pelagos FXD was built for combat swimmers, but its owner takes it up mountains instead: search and rescue training, GORUCK events, and a plan to ruck all six peaks of Mount Charleston in a single 24-hour push. It was also on his wrist for his daughter's first hike, which counts as much as any of the rest. A watch designed for one kind of hard use tends to be good at all of them. If you have a wrist shot from somewhere that matters, submit at the link in bio. Tempus Est Potentia.
Intel Report
Tudor Pelagos FXD
The Pelagos FXD was developed with the Marine Nationale's Commando Hubert, the French Navy's combat diver unit. The FXD designation refers to its fixed strap bars, machined into the titanium case so a strap cannot fail at the springbar. It runs no date, a bidirectional bezel for navigation timing, and full luminous markings for low visibility, one of the few modern dive watches built around an actual military unit's requirements rather than the dive-watch look.
The Mountains
The submitter runs his in the opposite environment from the one it was built for: alpine search and rescue training, GORUCK events, and high-altitude rucking across southern Nevada and northern Utah. GORUCK itself was founded by a Special Forces veteran and built around the ruck march, so the FXD is in fitting company. A watch engineered so its strap cannot fail underwater is exactly the watch you want when the failure point is a cold ridgeline instead.