In the final episode of Click's special India season, how Google is turning the country's 163-year-old railway into a fibre optic network to bring internet to all. Plus a soon-to-be weaponised underwater drone and the 'Uber of India'.

This edition investigates the rise of the robot butler, looking at whether voice-controlled personal assistants live up to the hype and at the potential dangers of living in a world where all electronics are controlled by voice.