What is a Helium Release Valve? - The Watch Doctor
Why Rolex has a helium escape valve on its Deep Sea's -
Holding Under Pressure - Explaining The Helium Escape Valve
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. #
The Doxa HRV – Vintage Panerai and other iconic timepieces under the loupe at Perezcope
Holding Under Pressure - Explaining The Helium Escape Valve