Could the fabled lost city of Atlantis have been located? Professor Freund explained how he led a pursuit to find the lost civilisation, believed by many to be an ancient Greek myth, by using deep-ground radar, digital mapping and satellite imagery. He contends that Atlantis, described by Plato in 360BC, in Spain's Donaña National Park, north of Cadiz, and was wiped out by a giant tsunami. Plato wrote it had been destroyed by a natural disaster in 9,000BC. Experts are now surveying marshlands in Spain to look for proof of the ancient city.

The world's deserts are lands of extremes that force animals to come up with ingenious ways of coping with hostile conditions, giving rise to the most incredible survival stories on earth. A pride of desert lions are so hungry they risk hunting a giraffe several times their size, while male sandgrouse fly 120 miles each day to the nearest waterhole and dice with death to collect water for their chicks. Filmed for the first time, a tiny bat does battle with one of the world's deadliest scorpions, and in Madagascar, a locust swarm of biblical proportions is seen as never before.

In the third episode, prominent adventure sports photographer Krystle Wright captures the immersive world of free-diving in Vanuatu, athletes who appear to walk on air in the canyons of Colorado, and powered para-gliders on the flooded salt pans of Utah.

Although the end of the Soviet Union also meant the end of the KGB, it did not mean the end of secret service activities. FSB and the foreign intelligence service SVR took over the tasks. Under the secret service officer Vladimir Putin, the tasks of the secret service were redefined, and digital age with the Internet brought new possibilities for internal and external espionage and for the manipulation of public opinion.
Coup d'etats, assassinations, sex scandals, radioactive poisoning....it's the stuff of a Bond movie. But in today's Russia, it's all very real. Under Vladimir Putin, the FSB rules Russia with an iron rod directly from the Kremlin. To challenge its authority, even from apparent safety abroad, means risking your life. The KGB has even managed to outlive communism itself. Today, Russia is no longer a State with a Security Service: instead, the Security Service has a State.

Widespread dietary changes are needed if we’re to combat the range of health problems associated with obesity and the environmental damage caused by industrial farming. Switching to a vegan diet is a potential solution, but selling the idea to the meat-eaters around the world is a tricky proposition.

Follows the decade-long odyssey of big-wave pioneer Garrett McNamara who, after visiting Nazaré, a small fishing village in Portugal, helped push the sport beyond the realm of imagination.
In the first episode, following a massive win at a competition at Maui's world-famous Jaws surf break in 2003, professional surfer Garrett McNamara comes out of retirement to pursue his lifelong dream of riding a 100-foot wave.