1960s saw more technical modifications that constituted the Tudor Submariner And the improvements continued well into the 1990s.

- Being waterproof to 500m (factory-tested to 625m);
- A titanium case and bracelet;
- A patented auto-adjusting clasp, which is needed to adjust during the dive when it is compressed because of water depth;
- Watch functions on the Tudor in-house movement calibre MT5612, which is resistant to shocks and vibrations;
- A 70-hour power reserve: Contrôle Officiel Suisse des Chronomètres (COSC) certification;
- A helium escape valve to protect the watch from saturation dives. As the helium atom is the smallest gas particle in existence, over time it is able to penetrate the interior of the watch despite its waterproofness. The helium escape valve allows the gas to escape freely from the watch without damaging it during the long decompression stage in the chamber. The helium escape valve accounts for this overpressure, preventing any watch damage; and
- Full luminescent display for clear readability.

The Pelagos up-close Tudor Pelagos Ref 25600TN

