De Bethune has chosen the ocean's deep for its first incursion into the sport segment with this dive watch, water-resistant to 100 metres. Acknowledging the need for maximum legibility when exploring underwater, the brand's founder and master watchmaker, Denis Flageollet, has developed a particularly ingenious, dynamo-driven lighting system that illuminates the movement and the indications from inside. A second innovation, the rotating bezel turns the sapphire crystal which carries the minute scale. Movement-wise, hours, minutes, seconds and a power-reserve are driven by De Bethune's twenty-seventh in-house calibre incorporating a next-generation balance wheel. A mechanical feast for the eyes, a champion of reliability, the DB28GS Grand Bleu maximises wearer comfort thanks to the ultra-light feel of its titanium and zirconium case, as well as the patented system of flexible lugs that adapt to the wrist for a perfect fit.