Cool stuff from GoPro, though I’d have liked a bit more detail on the actual camera/lighting settings:
Please note PetaPixel’s important note of caution:
Warning: This photography technique can be very dangerous and can cause serious bodily injuries and damage to a place if not done in a safe and controlled manner. In 2016 alone, steel wool photography has been blamed for burning down an iconic shipwreck and a 1920s landmark. Thus, it should only be done with appropriate care for surroundings, adequate safety equipment, and permission to use the specific location.