Unit 61398 in the Chinese Army is full of hackers whose job is to steal US trade secrets.

It's not clear exactly how many years the unit's been around, but it's thought to be responsible for the theft of hundreds of billions of dollars worth of intellectual property.

China agreed to stop stealing commercial secrets in 2015 as part of the world's first cyber espionage treaty, but ever since Donald Trump's trade war, those gloves have come off again.

America's science and technology secrets are its economic crown jewels. So just how much is being stolen, and is there anything that can stop it?

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Greg Austin, Professor of cyber security, strategy and diplomacy, University of New South Wales

James Martin, Associate Professor of Criminology, Swinburne University