Who would expect to find deep beneath their feet an ice-making machine, a telephone exchange, a waterfall, two frozen turbots, and a Prime Minister's bedroom?
This is the dark nether-world in which the Under London Expedition takes a light-hearted look at the strange, complex labyrinth of tunnels and sewers, railways and shelters, vaults, crypts and caves, which are as remote to the world above as the farthest reaches of Patagonia - and as full of surprises.

Last year Brazil's dreamers and builders launched a four-year programme to conquer the vast mysterious Amazon basin. Mechanised armies of bulldozers are slashing red-earth tracks through virgin rain-forest in an attempt to occupy the hinterland, but deep in the forest the Indians are fighting back with bows and arrows.
Construction of Brazil's Great North Road, from Manaos to Georgetown, has been brought to a standstill by one of the most hostile tribes ever encountered.
A BBC expedition by mini-hover-craft traces the route of the proposed jungle highway, from the Amazon to the Atlantic Ocean, and uncovers the strange story of a massacre in the forest.