Drones are flying underground in Japan to inspect parts of the Tokyo Metro

Maintenance workers in the bowels of the Tokyo Metro system are being assisted by emote-controlled 8.5-inch wide drones. The remote-controlled 2.5 pound (1.15kg) drone is encased in a plastic sphere to protect it from any unfortunate bumps and knocks while navigating the labyrinth. Cameras on the custom-built drone will allow operators to scan hard to reach parts of the tunnel network for signs of damage. Current methods involve humans using a torch and looking up to see signs of damage and then having to use vehicles and platforms to reach them. Maintenance workers in the bowels of the Japanese metro system are being assisted by 8.5-inch wide drones.