Viral shortform video is often augmented with subtle glued-on sound effects, but here's an interesting one - the background noise was "looped" for around 9 extra seconds to drive home the wow effect :)

https://www.youtube.com/shorts/7UZetfRezzI

This How Dangerous 😳 Cave #shorts #ytviral #facts #factshorts #like #trending

YouTube
You can sort of see the 5 repeats in the audio spectrogram (left) but especially the cepstrum (right - which shows echoes and repeating structure) has a sharp peak at 1878 ms, just a couple of bins wide