The lost caves of the Amazon

Help

Beneath the Amazon rainforest, scientists have recently discovered hundreds of massive caverns in the rich deposits of iron ore.

Most have not been properly explored and researchers believe they may host unique geology and life.

Excavations in one cave revealed evidence of human settlement 9,000 years ago.

Our science editor David Shukman and cameraman Tony Fallshaw were among the first news teams to venture inside.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.