First, the case: Rated to a depth of 300 metres (1,000 feet), the middle case is crafted from a solid block of a corrosive-resistant 904L steel. The fluted case back is hermetically screwed down with a special tool exclusive to Rolex watchmakers. The winding crown, fitted with the patented triplock triple waterproofness system, screws down securely against the case in a manner akin to a submarine’s hatch. It is protected by a crown guard that is an integral part of the middle case.

hen the bezel: Like the Submariner of 2010 and the GMT-Master II, the new no-date Sub has a bezel of Cerachom, which is virtually scratchproof and completely resistant to fading and corrosion.  The graduations in the bezel are actually PVD coated with platinum, and the dial and hands are filled with Chromalight to emit a long-lasting blue glow.

And the bracelet: This SUBMARINER is fitted with a solid-link OYSTER bracelet in 904L steel. It features a new-generation OYSTERLOCK safety clasp and glidelock extension system. The patented system, located beneath the clasp cover, allows fine adjustments of the bracelet length in 2 mm increments for a total of approximately 20 mm – without using any tools. This allows the watch to be worn over a diving suit up to 3 mm thick and provides additional comfort in any circumstance.