A robust construction, high pressure resistance, easy readability, and innovative technical functionality: these are the key features of the Aquatimer dive watches IWC has been engineering since 1967 and that are used by both professional and recreational scuba divers. The Aquatimer Chronograph is water-resistant to 30 bar and features a 44-millimeter case made of corrosion-resistant stainless steel. The diving-relevant indications on the blue dial are coated with luminous material to ensure optimum legibility under water. The external/internal rotating bezel combines ease of use with safety. The rotation of the external bezel is transmitted via a sliding clutch system to the internal bezel. The SafeDive system ensures that the inner ring with the dive time scale always rotates counterclockwise. Therefore, even in the event of an unintentional adjustment, the dive time can never be extended, and the diver's safety is guaranteed at all times. Thanks to the IWC quick-change system, the blue rubber strap can be exchanged for another bracelet effortlessly.