A swarm of giant cockroaches may sound like the stuff of nightmares, but Australian researchers say the insects could one day be used by search-and-rescue teams to deliver lifesaving drugs to people trapped after disasters.

Scientists from the University of Queensland and the University of New South Wales have developed what they call 'paraborgs' — cyborg cockroaches equipped with miniature injection devices and cameras. The research, published in the journal Advanced Science, describes how North Queensland giant burrowing cockroaches, the world's heaviest cockroach species at up to 8.5 centimeters, were fitted with tiny backpacks containing syringe cylinders and cameras.

The study marks a significant advance beyond earlier work on cyborg insects, which had focused exclusively on using them to locate victims. The paraborgs are designed not just to find people trapped in rubble, but to provide basic medical assistance before human rescuers arrive.

Operators steer the insects using implanted electrodes that stimulate their nervous system, allowing remote control of their movement. In tests, one 'observer' cockroach equipped with a camera locates targets, while a second cockroach carrying drugs is remotely triggered to deliver an injection.

"We start with anaesthetising the insect, immobilising them so that we make sure that they cannot feel anything during the implementation process," said biorobotics engineer Thang Vo-Doan, a study co-author. "Once we implant an electrode into the insect, we can apply a small electrical signal to activate or stimulate the nerve system so that they can respond to our command."

The system recorded a 100% success rate in reaching designated checkpoints during tests and an overall drug-delivery success rate of 72%. When injections were launched from within 15 centimeters of a target, success rates rose to 95%.

Real cockroaches were chosen over robots because no machine could match their agility, resilience, and minimal power requirements, the researchers said. "A lot of people might not like the sight of a giant cockroach scurrying towards them, but if you're trapped in rubble or stuck in a cave and need help, it could make a real difference between life and death," said PhD candidate Hai Nhan Le, a study co-author.

The researchers envision deploying swarms of paraborgs deep into collapsed structures to find and stabilize victims of earthquakes, building collapses, snake bites, or severe allergic reactions — situations where minutes matter.

The experiments were performed using silicone targets and pig skin under controlled laboratory conditions. The team said further testing is needed to address real-world challenges including complex terrain, signal loss in collapsed structures, and injection safety.