cataclysmic component failure
This is what happened when the pressure plate in SONEAT (Dad's '68 Sonett)... Grenaded.
Read MoreThis is looking from inside the engine bay, through the hole in the side of the bay that a piece of flywheel or pressure plate made... The white thing visible through the hole is the Koni damper that it dented before ricocheting into the wheel and taking a chunk out of that.
Note the additional small hole just above the big one.