Tony Robinson sends his drones to discover the mysterious workings of a sewage plant, a top-secret underground Cold War bunker and a super-sized luxury car emporium.
Tony Robinson sends his drones to discover the largest cave complex in Britain, hidden beehives on top of Fortnum and Mason, and a ginormous recycling plant for aeroplanes.
In the final episode Tony Robinson sends his drones to a top-security active nuclear decommissioning site, to discover the mysterious truth behind crop circles, and to explore the hidden world of some much misunderstood creatures - bats.