In addition to its robust and impact-resistant finish that utilizes the strength of stainless steel itself, the indispensable diver's watch, the unidirectional rotating bezel is designed to provide a firm grip even with wet hands or gloves.It also features a helium escape valve at 9 o'clock to handle saturated submersion of over 100 meters for professional divers who are required to work for long periods of time in deep sea conditions. Uses Powermatic 80 [Powermatic 80] movement boasting a long power reserve for up to 80 hours.The beard springs located at the heart of the watch are made of titanium base non-magnetic alloy Nivachron, a non-magnetic material thinner than a hair is not affected by magnetics, and it is of course highly durable and shockproof, it will continue to heartbeat like a heart, keeping accurate time. The wave pattern engraved dial depicts a blue gradation that deepens to the perimeter as if you dive into a deep sea.It also features a see-through case back that is 60 ATM water resistant and a very rare sapphire crystal material that can withstand this level of pressure.Interchangable quick release straps that can be easily replaced without tools.Not only for the sea, but also for daily use (replacement straps sold separately) This is the newest and best dive watch from TISSOT.