TUDOR diving watches have a history of use by the US Navy that dates back to the late 1950s. The new Pelagos FXD is a callback to those mission-critical timepieces. Its "FXD" name refers to its fixed strap bars, which are directly machined into the main body of the 42mm titanium case for added reliability. This modern Milsub also has a 60-notch rotating titanium bezel, outfitted with a ceramic insert and a 60-minute graduation filled with Swiss Super-LumiNova to meet the ISO standard 6425:2018 for divers' watches. The dial is matte black with applied hour markers and heritage "Snowflake" hands, all of which are also filled with Super-LumiNova for superior legibility underwater. It's powered by a TUDOR Manufacture Calibre MT5602 COSC-certified automatic chronometer movement with a weekend-proof 70-hour power reserve. Waterproof to 200 meters, it arrives on a forest green one-piece fabric strap and includes an alternate fabric-motif one-piece black rubber strap.