They addressed this very specific problem by introducing the 6159-7010. It took 20 patents and an unconventional approach to create the watch. Rather than incorporating a helium release valve like some
link of its contemporaries,
link the 6159-7010 never let any helium in the watch to begin with. It accomplished this through specially designed
link gaskets and seals. Again, water resistance doubled, and the "tuna," as it became known, was water-resistant to 600m.