BBC Earth

Feast your eyes on structural marvels brought to life when engineers are forced to go underground.

Swept away in the rapids in Northern Canada, Cyril is on the verge of hypothermia. He's in the northern reaches of the Cree First Nations territory to catch a mythical predator; the freshwater wolf.

Bad weather causes sea sickness among the team, and their next diving lesson has to be abandoned.

It's time to celebrate, as Steve Backshall's team of ten shark saviours have all passed their dive training and are now fully qualified scuba divers.

Episode one of Sue Perkins' Lost In Thailand opens in magnificent Northern Thailand where Sue explores the breath-taking beauty of the Thai Highlands.

Cyril's after a huge Aymara. Weighing in at 100lb, this fierce ambush predator is capable of snapping piranhas in half or swallowing them whole.

Steve encounters the largest and most sophisticated hunters on the planet, revealing how the ingenious strategies used by whales can sometimes get these extraordinary predators in trouble.

Robson's journey begins in Alter do Chao, known as the gateway to the rainforest, and the Amazon's answer to the Caribbean.

Cyril faces down a pack of starved black bears and endures rugged conditions when he embarks on a quest in northern Canada to find lake trout.

Cyril's after a huge Aymara. Weighing in at 100lb, this fierce ambush predator is capable of snapping piranhas in half or swallowing them whole.

Steve encounters the largest and most sophisticated hunters on the planet, revealing how the ingenious strategies used by whales can sometimes get these extraordinary predators in trouble.

Cyril faces down a pack of starved black bears and endures rugged conditions when he embarks on a quest in northern Canada to find lake trout.

Cyril's after a huge Aymara. Weighing in at 100lb, this fierce ambush predator is capable of snapping piranhas in half or swallowing them whole.

Steve encounters the largest and most sophisticated hunters on the planet, revealing how the ingenious strategies used by whales can sometimes get these extraordinary predators in trouble.

Episode one of Sue Perkins' Lost In Thailand opens in magnificent Northern Thailand where Sue explores the breath-taking beauty of the Thai Highlands.

Cyril faces down a pack of starved black bears and endures rugged conditions when he embarks on a quest in northern Canada to find lake trout.

Robson takes fellow actor Jo Joyner horse riding in the shadow of the Cheviots as he introduces her to Northumberland. An outdoor cookery lesson sees the pair make soda bread.

Robson, his brother David and his uncle Matheson head to the Scottish Highlands to take a pack horse camping trip. They learn to make a cup from wood and find a scenic fishing spot.

Feast your eyes on structural marvels brought to life when engineers are forced to go underground.