This 'crater' on the left hand side of the picture would almost certainly lead to a quench very quickly. The 'Kyoto camera' spotted this spot on a cavity's interior surface. It's a remnant from the production process that couldn't be eliminated during surface treatment, which led to the chemicals reacting with the surface in a different way than normal and causing the crater. In fact the cavity quenches at 13 MV/m.

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