iPhones and Apple watches use a MEMS (Micro-Electro-Mechanical Systems) timing oscillator instead of a larger quartz crystal for the base clock. Unless the MEMS is very well sealed, helium or other light gasses can seep in and disrupt it's operation.
This guy who works as the IT specialist in a hospital discovered this after an accidental helium leak and everyone's iPhones and Apple Watches stopped working.
https://ifixit.org/blog/11986/iphones-a ... to-helium/
iPhones are Allergic to Helium
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iPhones are Allergic to Helium
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“The Government of Spain will not applaud those who set the world on fire just because they show up with a bucket.” - Prime Minister of Spain, Pedro Sánchez

“The Government of Spain will not applaud those who set the world on fire just because they show up with a bucket.” - Prime Minister of Spain, Pedro Sánchez

Re: iPhones are Allergic to Helium
Nice. So if you exposed them to sulfur hexafluoride would they run slow?