What is a Helium Release Valve? - The Watch Doctor
Insider: Rolex Deepsea Sea-Dweller D-Blue Dial ref. 116660 a.k.a James Cameron. Built like a Marine Tank and Exceptionally Beautiful. — WATCH COLLECTING LIFESTYLE
ROLEX - Helium escape valve opens when the difference in pressure between the inside and outside of the watch reaches 3 to 5 bars, allowing helium to escape, thereby protecting the watch. #