Description: Omega Seamaster Planet Ocean 600M Pre-owned Omega Seamaster Planet Ocean 600M ref 215.30.44.21.01.001. Omega introduced the Planet Ocean line in 2005 as a serious professional diver, with deeper water resistance and a more robust design than the standard Diver 300M. The result is a watch that feels purpose-built for extreme conditions while still carrying the refined look expected from Omega. This model features a 43.5mm stainless steel case paired with a