Sigurd Tesche

With the aid of modern technology, reveal the unknown behavior of some unusual species of shark: lemon sharks and their white-tip reef counterparts.

As one of Germany’s beauties, the river was the gem of German landscape. But with industrialization it became the country’s hardest working river and like everything that has been overworked, it lost it magnificence and charm. Due to tender love and care, the river is now a reigning example of one of the most successful and outstanding renaturation projects in the country.

Every year, in the middle of Croatia, it's the same story: after the annual snowmelt, a huge flood wave spills out of the Alps toward Zagreb and Belgrade. This leads to an increase in the River Sava's water levels of some ten meters. In the species-rich, alluvial flood forests of the last major meadow landscapes of the continent, enormous predatory fish like the catfish lie in wait for prey.

Dark green, impenetrable forests cover a landscape with secluded valleys and rugged mountain ridges. 2.000 rivers and streams dig deep into the underground and transport their water into reservoirs or "Germany's Wild Amazon", the Wupper. These forests and rivers, together with heath-lands and moors, are home to a diverse fauna. Martens, badgers, wild boars, hares, roe deer, red deer and wild boars, even black grouse and hazel deer find shelter in these parts. Wolves have also have a dominant presence, not to mention those who live underground, such as lizards, bats, and snakes. Accompany us on a journey where we explore every corner of this rugged land. Climb underground into the Bergisches Land, through the vast hidden cave systems that sprawl far beneath the forests. There is also much to be discovered in the water, dive with us in crystal clear streams and rivers with their diverse flora and fauna.

These peculiar and roughly rabbit-sized rodents enjoy great popularity at the Grossglockner in the Austrian Alps. Before the last ice age, marmots used to live in the lowland of Tirol, but with the melting of the glaciers they were driven higher up into the mountains – a trend that will continue given the current climate change.

Wildlife filmmaker Sigurd Tesche delves into the mysterious world of the moray eel to reveal the secrets of this supreme underwater predator and the truth behind its ugly reputation.

The waters of the North Pacific around Canada's Vancouver Island are a strange and little known world. The water is incredibly clean, the location is isolated and huge thermal vents heat the otherwise cold surrounding these factors combined have led to animals and plants that can grow to huge proportions. Humpback whales, orcas, wolf eels and bald eagles all thrive here. Our team of experts go in search of the elusive Pacific Giant Octopus. Growing up to 7.5 meters across with the power to kill sharks, it is a formidable creature, but also intelligent and incredibly shy. The dive team invites us into an alien world, where persistence is rewarded with encounters with three of these magnificent creatures.

In warm waters around the world a cold-blooded killer hunts its victims. Mysterious in its movements, ferocious and feared, the terrifying Tiger Shark… distinctive in its dark stripes… These man-eaters are the stuff of nightmares… They can slip past our defences to savage us. Highly-adaptable hunters, they swallow up whatever they can catch. Even turtle shell is no defence against powerful jaws and saw-edged teeth.