A number of years ago, a F1 or Indycar driver took an upside down ride at speed. The trip down the track ground a hole in his helmet that, as I recall, was about 2-3 inches in diameter and did get into the foam. It looked nothing like the OP photo and it was created with the full weight of a open wheel race car on the drivers head.
Searched for a photo but could not find one.
My vote: Belt sander.
Jeff
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"I'm the one that's got to die when it's time for me to die, so let me live my life, the way I want to" - Jimi Hendrix
Cancer
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