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Rolex watches, the most recognised manufacturer of Swiss watches, has introduced the first mechanical watch in the world that can withstand the pressure of a deep sea dive to the depth of 16,900 feet being the equivalent of nearly 4 kilometres (3,900 metres) below the surface. The new Rolex Sea-Dweller Deepsea model released last year is capable of being submerged to a depth more than 10 times the current world record so it is unlikely to be bothered by any attempts on a new world world record. According to the Guiness Book of Records the deepest recorded scuba deep dive is 330 metres so this Rolex model can easily handle the pressure (excuse the pun).

 

Not only has Rolex made the world’s first watch that can be submerged to 3,900 metres or 12,800 feet, it also made the very first water resistant watch, called the Oyster, way back in 1926. The Oyster model is highly collectible in today's used watches market. Then in 1953, Rolex presented the world with the Submariner, a divers’ watch that was water resistant to 100 metres. Rolex continued to develop the Submariner and in 1971 launched the precursor to today’s Deepsea called the Sea Dweller, which featured a helium release valve and could be submerged to 610 metres.

 

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To make a watch withstand the pressure of being submerged to great depths, a watch usually has to be made so sturdy that it becomes very bulky and impossible to wear comfortably on the wrist. Rolex wanted to design a watch that was wearable on a daily basis so it took a different approach to the design of the Sea Dweller Deepsea. The case is a new and patented design that features a ‘Ring Lock System’ that utilizes three components to absorb pressure.

 

The first component is the crystal made of sapphire and 5.5 millimetres thick. The second component is the caseback which is made of Grade 5 titanium. Grade 5 titanium is an alloy with vanadium and aluminium and is four times stronger than the 904L steel case of the watch. The final component of the ‘Ring Lock System’ sits in between the crystal and the caseback for extra support and is a ring made of BioDur 108 steel. Being very high in its nitrogen content, BioDur 108 steel is very corrosion-resistant (which is useful if you are using it in salt water) and is three times stronger than the steel that makes up the case of the watch.

 

Choosing to use the combination of 904L steel, Grade 5 titanium and BioDur 108 steel to manufacture the Sea Dweller has resulted in a watch that can withstand the enormous pressures of being submerged to such great depths. But not only can it withstand the pressure, its dimensions of a case diameter of 43 millimetres and 18 millimetres deep is still very wearable by today’s standards. And if 3,900 metres sounds like an impressive number, Rolex are actually being conservative in their claims as they have successfully tested the watch to an almost unbelieveable 4,900 metres!

 

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