A dive watch is a type of timepiece specifically designed for underwater diving. It is characterized by its water resistance, typically rated to at least 100 meters, though many models exceed this depth. Dive watches often feature a unidirectional rotating bezel, which allows divers to track elapsed time underwater safely. The bezel's unidirectional nature ensures that accidental knocks can only shorten the dive time, not extend it, which is crucial for safety. These watches are built to withstand high pressure and are often equipped with luminous hands and markers for visibility in low-light conditions. The construction materials are usually robust, such as stainless steel or titanium, to resist corrosion from saltwater. Additionally, dive watches may include features like a helium escape valve for saturation diving and a screw-down crown to enhance water resistance. The design of dive watches is both functional and iconic, often featuring a bold, legible dial and a sturdy strap or bracelet. They are not only practical tools for divers but have also become popular as everyday watches due to their durability and distinctive style.