Inside Amazon cave
Media playback is unsupported on your device

The lost caves of the Amazon

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.

  • 19 Jun 2012
Go to next video: Uncertainty hampers Rio+20 talks