This handout photo obtained January 13, 2021 courtesy of Harvard University shows a Blueswarm intermingling with real fish.

Inspired by how schools of fish intuitively synchronize their movements, Harvard scientists have engineered miniature underwater robots capable of forming autonomous swarms.

Each robotic fish, known as a "Bluebot" is equipped with cameras and blue LED lights that sense the direction and distance of its schoolmates inside water tanks. They swim using flapping fins rather than propellers, which improves their efficiency and maneuverability compared to standard underwater drones.