Hamilton Khaki Navy Belowzero Titanium Auto H78535380Water resistant up to 100 bar (1,000 m) and equipped with a helium escape valve, the Khaki BeLOWZERO is perfect for even the most daring of deep water adventures. The convex sapphire crystal offers high performance protection during underwater exploration and its bright yellow rubber strap, paired with a 46mm brushed titanium case make it reminiscent of the bulk of a yellow submarine. This Hamilton is a nautical classic designed for marine pioneers.