It’s a controversial new industry being built right under our noses. By a cast of characters who sound like they’re straight out of an Agatha Christie novel. We’re talking about deep-sea mining.  It is the last frontier on earth yet to be mined for riches. Many argue that deep sea mining will benefit the environment. But others, like world-famous environmentalist David Attenborough, say that it’s unthinkable to embark on this practice until its environmental impact is better understood. Today, journalist Sherryn Groch, on the privatisation of the world’s seabed that is happening behind closed doors.Subscribe to The Age & SMH: https://subscribe.smh.com.au/See omnystudio.com/listener for privacy information.