Some watches are made to look like divers. Others take their underwater operation seriously. The Unimatic ProDiver U1S-T-PD6-B is the latter. It has an ultralight sandblasted grade 2 titanium case, which combines with the screwed-in professional diver caseback, the 8mm diameter screw-down crown, and high-quality gaskets to boost water resistance to 600m. The 120-click mono-directional safety bezel has a black ceramic insert with blue Super-LumiNova markers to match the minutes hand, while the hour hand, seconds hand, and geometric markers on the matte black dial glow orange, making it easy to keep track of dive durations. It's powered by a Swiss-made automatic Sellita SW200-1 28800BPH movement, sits on a heavy-duty black NATO strap, and is limited to 300 examples.