Indonesia's Raja Ampat is home to some of the most spectacular marine life in the world. It is known as "the Miracle Sea," and a team of filmmakers from Japan will find out why as they dive into this secret world for the first time. They'll reveal the riches of the glowing coral reefs that light up the seabed and put Raja Ampat's unrivalled reputation for wildlife to the test.

The smartphone revolution comes with a hidden cost. A joint investigation by FRONTLINE and ProPublica explores the hazardous work of independent contractors who are building and servicing America’s expanding cellular infrastructure. While some tower climbers say they are under pressure to cut corners, layers of subcontracting make it difficult for safety inspectors to determine fault when a tower worker is killed or injured.

The elusive qualities of sex appeal are examined through the lens of science in this probing documentary, which reveals the evolution and function of every component of human attraction. In this study of the science behind "chemistry," you'll learn how the subtlest sounds, sights and smells can affect sex appeal, and how genetic, hormonal and neurological factors create sparks between people.

In this landmark series, the BBC Natural History Unit explores a vast ocean that stretches nearly 10,000 miles, from Arctic to Antarctic and from sun-drenched tropical reefs to crushing abyssal depths.

Historian Dan Jones explores the turbulent history behind six of Britain’s most famous castles: Dover, the Tower of London, Warwick, Caernarfon and Stirling. Behind the walls of these celebrated strongholds are stories of intrigue, drama, romance, rebellion, and murder. Dan Jones recounts some of the many classic tales from 1000 years of British history, featuring a stellar cast of kings, queens, rogues, rebels, victims and villains.

Dave Fishwick and Kate Quilton investigate the true value of products and services, exploring how much things cost to make and giving tips on how to get the best deals.