It is the climax of the expedition as the team prepares to explore a 100-metre chasm at the very bottom of the Amazon river. Scientists have no idea what lurks within. Show more
Discover 11,128,835 listings and 280,365 playable programmes from the BBC
It is the climax of the expedition as the team prepares to explore a 100-metre chasm at the very bottom of the Amazon river. Scientists have no idea what lurks within. Show more
BBC One
