The PADI timepiece collection is exclusive to Seiko as the only global watch brand to design a range of professional diver's watches in official colours featuring the PADI logo. PADI (The Professional Association of Diving Instructors) is the world's leading scuba diving training organisation, unifying divers around the globe who share a passion for adventure and love for the ocean. The watch shape is affectionately nicknamed by Seiko fans as a 'Tuna' - because of its larger diameter and bold shape like a tuna tin - loved for decades since its 1975 release. Solar-powered, the watch charges from natural and electric light. The accordion-style silicone strap combines high durability and comfort - a strap design invented by Seiko in 1975 as a practical solution to the expansion and contraction of a diver's wrist at different depths. Seiko Prospex watches are designed for sports lovers and adventure seekers whether in the water, in the sky or on land. Since launching Japan's first diver's