According to staff at Willis Tower, the cracked portion you see here was a part of the safety seal of the observation platform and not the glass itself. Still, that's the last thing you want to see when you're suspended that high in the air.
I'll give you exactly one guess to figure out where these daring climbers come from:
If you said Russia, you've been paying attention to the internet! Congrats!
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Anybody Care to Decipher This One for the Less Math-y Folks?
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