Late 1980s & Tham Luang - The Royal Cave where the Wild Boar football team got stuck.
abcnews.go.com
An innocuos hole in the ground
but damn big inside
And with no lights we went back outside.

Rescued boys explain how they survived in Thailand cave for 2 weeks
The 12 young soccer players and their coach rescued from a Thai cave never gave up hope of being found alive and passed the time digging into a rocky wall.
An innocuos hole in the ground
but damn big inside
And with no lights we went back outside.