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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. #
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![Rare Rolex 5513 "Comex" Submariner with Helium Escape Valve c1971 | eBay](https://i.ebayimg.com/images/g/dqYAAOSwemZkziX6/s-l1200.webp "Rare Rolex 5513 "Comex" Submariner with Helium Escape Valve c1971 | eBay")
Rare Rolex 5513 "Comex" Submariner with Helium Escape Valve c1971 | eBay
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