A hundred sea miles north of the Solomon Islands in the South Pacific Ocean there are two idyllic atolls called Nuguria.
Hermann Schlenker, a German explorer and film maker, spent a summer with the islanders. His film shows these gentle, primitive people in their last year before they learn to read and discover the world beyond their islands.

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.