An alert system using autonomous drones to detect sharks off Sydney beaches could be in place by summer, scientists say.

From drones, to smart drumlines and personal devices that deter attacks, we have better ways to keep swimmers and surfers safer, but we need to deploy them.

From drones, to smart drumlines and personal devices that deter attacks, we have better ways to keep swimmers and surfers safer, but we need to deploy them.

An alert system using autonomous drones to detect sharks off Sydney beaches could be in place by summer, scientists say.

Another shark attack in Sydney has increased the need for better early warning systems.