This is a huge ancient forest world discovered 300 meters down a sinkhole in Hubei, China, containing a unique ecosystem of ancient trees, plants and animals (more information in the comments) :
A giant sinkhole in China has an ancient forest growing inside : NPR
Ancient forest found at bottom of huge sinkhole in China | Trees and forests | The Guardian
Scientists find a forest growing inside a giant newly discovered sinkhole in China
Untouched ancient forest discovered inside colossal sinkhole in China • Earth.com
Chinese road engulfed by giant sinkhole | Daily Mail Online
Explorers in China discover a 600-foot sinkhole with a huge ancient forest inside - Life
Xiaozhai Tiankeng - Wikipedia
Pre-historic forest discovered in giant sinkhole in China - YouTube
:max_bytes(150000):strip_icc():focal(674x489:676x491)/Hidden-Forest-41a2030d373c4524a7682fb69601d66a.jpg "Giant Sinkhole Reveals Massive Ancient Forest in China")
Giant Sinkhole Reveals Massive Ancient Forest in China
Watch: Giant 630-foot-deep sinkhole with lush ancient forest discovered in China
Live: A virtual tour of newly discovered giant karst sinkhole in China - CGTN
Huge ancient forest world discovered 630 feet down sinkhole in China
China discovers giant sinkhole with an ancient forest at the bottom - The Watchers
This Sinkhole In China : r/Damnthatsinteresting
Huge ancient forest world discovered 630 feet down sinkhole in China
This giant sinkhole has a whole forest inside it l 360 on History
Sinkhole Swallows Buildings in China
China's huge and mysterious Xiaozhai Tiankeng sinkhole
Massive sinkhole swallows up four pedestrians in China | CNN
A Sinkhole Opened Up And Swallowed 2 Cars In China. Luckily, Nobody Was Hurt
Giant sinkhole with a forest inside found in China | Live Science
Used as a rubbish dump: Incredible Chinese sinkhole to be transformed into tourist hotspot | Travel News | Travel | Express.co.uk
