It has been reported that an AirPod has managed to survive passing through the entire digestive system of an adult male human being. Fortunately, this is not some new horrifying development test by Apple nor is it an extreme benchmark created by a voracious tech blogger. It's simply the result of a case of accidental swallowing while sleeping.
https://www.notebookcheck.net/AirPods-survive-brutal-durability-test-by-passing-through-human-digestive-system-without-a-scratch.420109.0.html