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xkcd #3158: Shielding Chart
(imgs.xkcd.com)
Title text:
Sharks can occasionally travel short distances through air when pursuing prey, but their attenuation coefficient is pretty high.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3158/
Yeah, I did read some time ago that the max hole size was like half the wavelength and there existed also a penetration depth. I guess this makes sense with light making it through fences.