All concrete collapsing, massive drops/increases in pressure that can shatter your eardrums, untreated metals cold welding, full UV rays going through an Ozone layer that no longer exists, planes fall out of the sky… oh and yeah the Earths mantle just fucking collapsing in on itself and essentially dissolving as its composition has an enormous amount of oxygen
I didn’t mean to make any claim, lol, 5 seconds would be nothing and I’m trying to be funny in the vain it no O2 being not a big deal at 5 seconds.
We had an ozone crisis before, although it is serious if it’s something closer to an hour. People got sunburned in 15 minutes quite easily, though, and skin cancer is linked to it.
The atmosphere does block a lot of cosmic ray junk, but that’s a collective effort. I forget the details, but think very high frequency gamma rays. But that’s not ozone alone.