China reveals secret programme of unmanned drone submarines dating back to 1990s

A research team in China has unveiled an underwater drone that can recognise, follow and attack an enemy submarine without human instruction.

The secret project, funded by the military, was partially declassified last week with the publication of a paper that gave a rare glimpse into a field test of the unmanned underwater vehicle (UUV), seemingly in the Taiwan Strait, more than a decade ago.