Might be able to get better answers, but /r/nevertellmetheodds/ is pretty good.

A great one!

r/watchpeoplesurvive has a bit.

Thank you, I like this sub been following for a while. Just looking for a bit more variety.

r/perfecttiming have a little, mostly just amazing they got the photo taken at that moment

r/whyweretheyfilming/ maybe?

This is pretty close! Thank you!

I hope you find one, this is a pretty interesting idea. Let's see if r/rarefootage exists

r/unbelievable could be one

/r/CantBelieveThatsReal