Over his diving career there were a number of excellent dive watches that Mayol could have relied on, but his preference was Aquastar and he relied on several several Aquastar models including the Deepstar, Benthos 500, the 63 and Regate.

Jacques Mayol was a French diver and the holder of many world records in free diving. Mayol was one of the screenwriters and authored the book Homo Delphinus: the Dolphin Within Man of his philosophy about the aquatic origins of humans. On 23 November 1976, at 49, he became the first free diver to descend to 100 meters (330 ft), and when he was 56 he managed to descend to 105 meters (344 ft). During the scientific research phase of his career, Mayol tried to answer the question of whether man had a hidden aquatic potential that could be evoked by rigorous physiological and psychological training. Mayol’s lifelong passion for diving was based on his love for the ocean, his personal philosophy, and his desire to explore his own limits. During his lifetime, he helped introduce the then-elitist sport of free-diving into the mainstream. His diving philosophy was to reach a state of mind based on relaxation and yoga breathing, with which he could accomplish apnea. He also contributed to technological advances in the field of free-diving, particularly improving assemblies used by no-limits divers. He was also instrumental in the development of scuba diving’s octopus regulator, which was invented by Dave Woodward at UNEXSO in 1965 or 1966. Woodward believed that having safety divers carry two second stages would be a safer and more practical approach than buddy breathing in the event of an emergency