Deep One by IWC is an automatic watch that is water-resistant to 100 m and fitted with functions specially designed for professional divers. Thanks to an interior rotating ring operated with the crown at 2 o’clock, it can record the length of a dive and the depth to 45 m. The bathometer is operated with the crown-valve at 4 o’clock. This precision instrument comes in a titanium case from the GST line, and on a matching bracelet.