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Congrats @poyim! You were the closest guess. It was actually shot at 32,000 ISO. I was doing some ISO invariance tests on my camera to see if the noise is the same when shot at everything from 800 to 32,000, and it is, well at least the luminance noise. I found that the photos had more color saturation and certainly better dynamic range when shot at lower ISO (800-3200). But I can comfortably say that I'd have problem shooting at 32,000 ISO should the occasion arise.

Wow. I got lucky! lol. I would have never guessed it would be that high.
Thanks!