The Omega Planet Ocean “Deep Black” GMT is a quite large watch at 45.50mm x 17.38mm, with a water resistance of 600 meters. It’s a combination of many of Omega’s most cutting edge features in a dive watch – LiquidMetal numbers on the zirconium dioxide ceramic bezel, a helium escape valve, zirconium dioxide case and caseback and inside of course, one of the industry’s most technicall advanced mechanical movements. This is the Omega Co-Axial Master caliber 8906, running at 25,200 vph with a 60 hour power reserve, and featuring a co-axial escapement, with silicon balance spring, free sprung adjustable mass balance, and a resistance to magnetic fields of up to 15,000 gauss strength (and probably considerably in excess of that).