What's it sound like as the airlock is depressurized?

I have a scene where an alarm is sounding in an airlock, as the pressure is lowered from normal atmospheric pressure to vacuum (takes a few minutes). How would this alarm sound to an unprotected person unlucky enough to be in the airlock?

What would this also sound like to someone inside a pressurized space suit?

A good answer will describe the sounds for both protected and unprotected ears, covering pitch changes, filtering effects, etc, as well as comment on at what point unprotected eardrums may rupture, and what that might sound like.

(in my case, the air is being recycled by noiseless pumps sucking the air into storage.. but I am curious what it might sound like if a valve was venting air into space.. would that add a noisy hiss?)

posted over 5 years ago

Innovine‭

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