The Blue Shark IV is a beast of a dive watch. With a massive 47mm stainless steel case, 5000m water resistance, and a helium escape valve, it’s one of the deepest-diving mechanical watches out there. The black dial (also available in other colors) adds a stealthy touch, while the automatic movement ensures reliability. Despite its extreme specs, it’s still comfortable on the wrist, if you can handle its size. For hardcore divers and statement-piece lovers alike.