America’s next mining venture could be deep below the sea’s surface, removing nodules on the seabed full of the metals vital for the green energy transition. 

Polymetallic nodules are like golf balls which sit more than four kilometres deep and haven’t been touched for millions of years. 

An Australian-born businessman is leading the push to extract potentially trillions of dollars-worth of the material and he has the support of US President Donald Trump. 

Today, Four Corners reporter Mark Willacy on the potential and risks around seabed mining and what it could mean for Pacific nations. 

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Mark Willacy, Four Corners reporter