Oris Aquis Depth Guage Mens Watch 01 733 7755 4154-set RSRenowned for producing specialist diving timepieces; Oris is proud to introduce the second generation of the Aquis Depth Gauge. At the forefront of mechanical watch innovation, Oris were the first to produce one of the world's most innovative and most distinctive high-performance watch for divers which measures their depth in water by allowing water to enter the timepiece. Known as 'the watch with a hole', the Aquis Depth Gauge uses scientific principles of the Boyle-Mariotte Law that allows water to through a hole at 12 o'clock in a patented system. This creates a watermark that relates to a gauge that indicates in yellow on the dial. This all new model reflects all of the spirit and functionality of the original model but delivers an even higher performance when and when it really matters...deep beneath the ocean surface.