A story of castaways, similar to Robinson Crusoe and The Swiss Family Robinson, this book details the escape from Civil War-era Richmond, Virginia, of five Northern men who dared to go aloft in a balloon in the midst of a hurricane. Deposited on a lonely island in the Pacific, they make do with Yankee ingenuity where Chance has left them nothing. Only later do they find they have a hidden benefactor: Captain Nemo, of 20,000 Leagues Under the Sea, who resides, alone, secretly on the island. In time, the tiny colony becomes so prosperous that it is able to rescue another castaway from an island a hundred miles away. But all their work will come to naught - their island's volcano is about to awake!
Read by Mark F. Smith.

This episode explores "Planet Earth's final frontier": the world of caves. At a depth of 400 metres (1,300 ft), Mexico's Cave of Swallows is Earth's deepest pit cave freefall drop, allowing entry by BASE jumpers. Its volume could contain New York City's Empire State Building. Equally as impressive, we explore the otherworldly underwater caves of the Yucatán Peninsula. Divers appeared to be flying in water as clear as an air, as they give us a glimpse of the hundreds of kilometers of these caves which have already been mapped. Also featured is Borneo's Deer Cave and Gomantong Cave. Inhabitants of the former include three million wrinkle-lipped bats, which have deposited guano on to an enormous mound. In Gomantong Cave, guano is many metres high and is blanketed with hundreds of thousands of cockroaches and other invertebrates. Also depicted are eyeless, subterranean creatures, such as the Texas blind salamander and ("bizarrely") a species of crab. Carlsbad Caverns National Park is featured with its calcite formations. Mexico's Cueva de Villa Luz is also featured, with its flowing stream of sulphuric acid and snottite formations made of living bacteria. A fish species, the shortfin molly, has adapted to this habitat. The programme ends in New Mexico's Lechuguilla Cave (discovered in 1986) where sulphuric acid has produced unusually ornate, gypsum crystal formations. Planet Earth Diaries reveals how a camera team spent a month among the cockroaches on the guano mound in Gomantong Cave and describes the logistics required to photograph Lechuguilla. Permission for the latter took two years and local authorities are unlikely to allow another visit.

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