National Geographic

'S6/E7 - Training Grounds'. To survive deep winter and maintain their subsistence lifestyles, Alaskans learn new skills and endure deadly hardships.

'S1/E6 - Tension On The Line'. With the help of local villagers, Cyril and his team battle a flooded forest and insect stings in their search for pirarucu and piraiba.

'S1/E5 of 6 - Oil Tanker Emergency'. The Coastguards trace smugglers tracks and stumble upon a remarkable discovery. Meanwhile, a Coastguard plane searches for a missing fishermen.

'Air Crash Investigation: Special Report. S1/E8 of 12 - Controversial Crashes'. Safety in the sky depends on the outcome of air crash investigations, but investigators sometimes disagree.

'S1/E7 - Edge Of Disaster'. Cyril and his team battle for survival against hidden stingrays, black piranhas, and massive falling trees on their search for the Piraiba.

'S2/E17 - The Name's Boondi'. Discover how a cake within a cake, a crunchy and spicy Indian snack, sinfully tender-frosted sugar cookies and mouthwatering Greek spinach twisters get to the masses.

'S2/E18 - Abba Zaba Doo!'. Discover how scrumptious burritos, lip-smacking bacon-fried rice, sweet little Maraschino cherries and chewy Abba-Zaba candy bars get to the masses.

'S6/E5'. We discover the secrets to wake surfing, the hidden dangers with water slides and the hidden hazards to watch out for when practicing your sparring kicks.

'S6/E6'. We find out the best way to avoid injury when kayaking over a waterfall, what to watch out for when putting your feet behind your head, and the secrets of the avalanche.

'S2/E3 - Good Eating'. Indigenous Alaskans subsistence hunt and forage to provide food for their families.

'S1/E8 - The Longest Journey'. To celebrate Canada's 150th anniversary, a vintage luxury passenger train-the Royal Canadian Pacific-is making an historic cross-country journey.

'S1/E4 of 6 - Musket Men'. Hazen Audel tackles an epic survival challenge seeking out tradional musket hunters high on the Bolaven Plateau in the Mekong Basin.

'S6/E8 - Brain Power'. Problem-solving, protecting and preserving are key tenants the next generation of Alaskans must live by.

'S1/E6 of 6 - Caught at Sea'. The Search and Rescue team assists a boy who may have broken his back and a boarding team intercepts a boat of refugees.

'Air Crash Investigation: Special Report. S1/E9 of 12 - Deadly Distractions'. In 1981, the Federal Aviation Administration established a sterile cockpit rule requiring pilots to refrain from non-essential activities during flight.

'S1/E6 - Titan Missile, Estonia, Piper Alpha'. Three real world disasters forensically dissected. Arkansas nuclear missile explosion, sinking of the Estonia and the explosion on the oil rig Piper Alpha.

'S1/E2 - River Deep Mountain High'. Amidst mountains and whale watching, Ranulph Fiennes and his cousin Joseph reflect on Ran's epic life and his new challenge of life with Parkinson's.

'S5/E6 - Audie Murphy's Finest Hour'. When 2nd Lieutenant Audie Murphy runs out of bullets, he climbs on board a burning tank destroyer to fight on and become a Hollywood legend.

'S7/E2 of 16 - X-Rated High'. The porn industry and drugs have a reputation for going hand in hand, but after a number of HIV scares, porn sets in LA are under more scrutiny than ever.

'S1/E5 of 5 - Government Breaks Silence'. In 2015, U.S. Navy pilots report having strange encounters with UFOs that have no wings, no cockpit, no exhaust, and somehow fly with great agility.

'S1/E4 - Apollo 13'. Apollo 13 is on its way to the moon, but when Jim Swigert performs the housekeeping chore of stirring the oxygen tanks, he unwittingly triggers a catastrophic explosion.