designer's own words:This watch was designed for an user who loves extreme situations, depth and cold waters, high altitudes, and all kind of risk situations that raise the adrenaline. The case is made of High Grade stainless Steel, tested to support high pressures because its parallelogram sealed case. On the left of the case, it is positioned the air relief valve and on the right the watch crown control. The adjust crown has a stainless steel inserted that prevents damages in the watch mechanism. The display has big hour numbers that helps the user to see the hour in any situation. Moreover, it has two auxiliary dials, one located at 6 pm which is the 60 second hand and another, a depth / altimeter tester, located at 3 pm. The Submariner has an Automatic Swiss Movement Caliber xxx that allows a 72 hour of power reserve. The wrist strap is made of TPE (elastomeric) and includes a safe and fast stainless steel hitch. The Submariner is a lightweight watch because the CNC cuts on its sides that reduce the weight without compromising the strength.