A suspected Chinese submarine drone has been discovered by Indonesian fishermen in waters considered strategically important to Australia. Indonesian military officers are now trying to determine what data was being collected by the unmanned underwater vehicle that was found just before Christmas. Are these drones part of any illegal, illegal surface activity or even some sort of espionage? The high-tech surveillance glider was recovered in the middle of a crucial maritime route that links the South China Sea with the city of Darwin. Australia's Defence Department has declined to comment.