Chilean authorities investigate a mysterious large sinkhole near a copper mine

 https://www.reuters.com/world/americas/chilean-authorities-investigate-mysterious-large-sinkhole-near-copper-mine-2022-08-01/

A 200m deep hole is quite  a serious concern.

https://www.mining.com/web/chile-probes-giant-sinkhole-at-lundin-underground-copper-mine/

https://www.theguardian.com/world/2022/aug/02/sinkhole-25-metres-wide-prompts-investigation-near-chilean-copper-mine

Whenever a sinkhole starts to suddenly collapse, there might not be enough time to avoid it.

https://www.abc.net.au/news/2022-08-02/geologists-investigate-mysterious-sinkhole-chile/101291122

https://www.bloomberg.com/news/articles/2022-08-01/chile-probes-giant-sinkhole-at-lundin-underground-copper-mine

https://www.dailymail.co.uk/news/article-11072455/The-black-hole-Chile-82ft-wide-650ft-deep-sinkhole-appears-near-small-town.html

https://en.wikipedia.org/wiki/Sinkhole#Formation

https://en.wikipedia.org/wiki/Padirac_Cave

https://en.wikipedia.org/wiki/Cenote

The Blue_hole of water can be a very interesting place to explore.

https://en.wikipedia.org/wiki/Great_Blue_Hole

https://en.wikipedia.org/wiki/Cenote#Scuba_diving

https://en.wikipedia.org/wiki/List_of_sinkholes

https://www.wondermondo.com/largest-and-most-impressive-sinkholes-in-the-world/

https://webecoist.momtastic.com/2008/08/26/incredible-strange-amazing-sinkholes/