Would the sensation be similar to being at high altitude without oxygen? There is a Smarter Every Day video from several years ago where the host conducts simple cognitive and motor function tests in a pressure chamber which simulates high altitude atmospheric conditions. Within a couple of minutes of being off oxygen, he’s suffering from hypoxia and is unable to either continue the tests, or to mask up, despite being told the he will die if he doesn’t secure oxygen. Admittedly, it’s incredibly chilling to see the guy rendered so helpless, but, from his perspective, it did not seem particularly traumatic. As I understand it, if he had not had his mask applied for him at that point, he would have lost consciousness and then died in his sleep shortly thereafter. All things considered, not the WORST way to go. Beats getting stuck in that compartment with a leak and eventually drowning.
More a piece “inspired by” than a direct translation, but, if you have any affinity for classic metal music, Savatage has you covered.