I watched one come apart right in front of me, a few decades ago. Old, rusty truck. We were heading into an underwater tunnel too. I saw something odd, then saw sparks, so I slowed way down. The back left wheel really began to wobble, then suddenly separated! It passed the truck body straight into head-on traffic....inside the tunnel!
One guy in a Camero did Chevy proud the way he quickly swerved out of the way then back into his lane.
Of course, the back rear was now on the concrete, throwing up a huge, shower of orange sparks. It slowly ground to a halt. The driver dude jumped out and poured his beer onto it! He was freeking out.
I was the first to go around him. They later closed the tunnel to clean it up.
Can you imagine a head-on 120mph collision with a truck wheel, rolling straight at you.....inside of a tunnel? The first guy swerved, not sure what happened to the wheel after that.