Pop! Goes the Tire
This appears to be quite terrifying! It’s similar to what happens when you unintentionally drop water on a Gremlin’s back—more nasty Gremlins emerge. or perhaps some other kind of extraterrestrial egg that has made a deep hole in your tire.
However, bubbles like these in your tires are a major problem that has to be addressed right once; fortunately, there’s an easy fix!