The Omega Seamaster Planet Ocean 600M Ref. 217.30.42.21.01.001 is a masterful tribute to Omega’s deep‑sea exploration heritage, introduced in 2025 as a bold evolution of the iconic dive watch collection . This 42mm stainless steel timepiece features a slimmer profile, balancing a robust build with refined wearability . The matte black dial offers exceptional legibility with rhodium‑plated hands and indexes filled with white Super‑LumiNova, complemented by four rhodium‑plated Arabic numerals for a distinct tool‑watch character . Its unidirectional rotating bezel, crafted from polished black ceramic with a white enamel diving scale, sits atop an inner ring made from polished grade 5 titanium, underscoring its high‑performance construction . At its heart beats the Omega Co‑Axial Master Chronometer Calibre 8912, a METAS‑certified automatic movement delivering exceptional precision, antimagnetic resistance up to 15,000 gauss, and a 60‑hour power reserve . Engineered for professional aquatic performance, it offers 600 metres of water resistance and is secured by a robust stainless steel bracelet with an extendable foldover clasp and diver extension, ensuring a perfect fit over a wetsuit . With its closed, screw‑down caseback in grade 5 titanium featuring Omega’s iconic seahorse emblem, and the deliberate absence of a date window for visual symmetry, this fourth‑generation Planet Ocean is a purposeful, technically advanced instrument that honors Omega’s maritime legacy . Key specifications: 42mm stainless steel case; black ceramic bezel; matte black dial with rhodium‑plated hands and indexes; Omega Calibre 8912 automatic Master Chronometer movement; 60‑hour power reserve; 600m water resistance; stainless steel bracelet; flat sapphire crystal with anti‑reflective treatment .