Hamilton Watch Khaki Navy BelowZero Auto Titanium H78505330. A new titanium case adds lightweight durability to the high performing Khaki Navy BeLOWZERO. Water resistant to 100 bar (1,000 m) and equipped with a helium escape valve, this submarine inspired watch is perfect for your next water ature. The impressive 46mm titanium case treated with black PVD is the epitome of stealth style and features a special diving mask embossed on the case back.