Ever seen a nail/screw do this to a tire?

[BYprodriver]

Originally Posted by stephen wilson

That damage must have been done when the tire was dismounted. With the tire still inflated, there's nothing to cause a screw to bend INSIDE the tire, to cause that damage. If the tire was left on the wheel and plugged, you would have likely been OK.

Good example of why a damaged tire should be dismounted to allow for a inspection of the interior for further damage. Plugging a tire from the outside usually causes more damage than the initial puncture due to the size of the tool. If enough moisture gets to steel belts they begin to rust, & as Neil Young says, "rust never sleeps"