Hearing loss that’s attributable to skydiving happens because of damage to the cilia of the inner ear. (Cilia are the tiny, hair-like cells that vibrate with the pressure of sound waves and tell the brain about it.) Too much exposure to those waves wears them right out. Once they can’t wiggle anymore, it’s over. They don’t bounce back.

Alongside general hearing loss, you might get a bonus symptom: tinnitus. If the cilia are bent or broken due to excessive sound exposure, they can dribble out random electrical impulses to your brain, causing you to hear sound where none exists. Basically, this results in a constant ring/roar/buzz/hiss/squeal that lives inside your head 24/7. If that sounds like hell, you’re absolutely right.

Decibel levels are not linear; they’re logarithmic. Linear measures are measured with addition and subtraction (for example: four miles is twice as long as two miles). Logarithmic measures ratchet up by factors of ten. This means that every increase of 10 on the decibel scale represents a 10-fold increase in the intensity of the sound it measures. Noise that clocks in at 20dB is 10 times louder than a sound of 10dB. 30dB? 100 times louder…so look differently at decibel measures than you do at the numbers in your bank account.

The noise we’re subjected to on the ride up can reach around 100dB — which government standards decree is only healthy for around 15 minutes. You’re in the tin can for 20-30.