Drones and other driverless vehicles on the ground and in the water came together in a stunning piece of choreography staged at the Hong Kong-Zhuhai-Macao Bridge for Friday night's CCTV Spring Festival Gala. The bridge is the world's longest over-sea bridge and the largest steel-structure bridge. Three hundred drones assembled into a dolphin formation that “jumped” through the bridge. They were made and controlled by ZEROTECH from Beijing and HighGreat from Shenzhen.