Death at Lu'um Balam

Any know this cave -- Lu'um Balam (Jaguar dirt)?

https://www.riviera-maya-news.com/ma...oved/2017.html

I think it might have been a freediving death.

http://therivieramayatimes.com/russi...-mayas-cenote/

Machinery needed?? How did he entered in this place, through the wall??