In this installment, the sea creatures in the Oosterschelde are busy spawning and the male cuttlefish prepare for mating battle.

In the series finale, Corinna finds Mark on her doorstep standing in the pouring rain. Judging from the melancholy French chanson in the credits, there seems to be a spark of hope for them.

Dressed as the schlager star Heino, Otto does a parody of Heino's cover version of the song "Junge," originally by the German punk band Die Ärzte.

Legendary German band Die Toten Hosen sing their song "Europa" about the adversity faced by refugees.

Otto reveals his true feelings about performing in Kempten with the help of a lie detector.

Toasting your friends and setting off fireworks is an essential part of the New Year celebration, but unfortunately the animals in the Berlin Zoo don't feel the same way! See how the Berlin Zoo tries to deal with the problems of inner-city fireworks and their animals. (video copyright dpa)

Florian and Natali finish a great first dive with the basking sharks and then make their way to the coast of Holland.

Diane interviews passersby at the Christmas market in Karlsruhe to learn about their Christmas traditions.

All across the country, refugees are now receiving German instruction from volunteers because they are not officially entitled to it when they first arrive. Three educators from Bavaria have developed their own teaching materials especially for this purpose. Sehr interessant!

The North Sea is an unpredictable and mysterious marine habitat, teeming with life. Join marine biologists Florian Graner and Natali Tesche-Ricciardi on an exciting adventure!

Annually over 100 million animals are lodged in Frankfurt's Animal Lounge. A wide assortment of living creatures are temporarily received, examined by a veterinarian and lovingly cared for. Viel Spaß!

Twenty-five years since the fall of the Berlin Wall: Peter Barsch lived in East Germany and, as a young man, spent time in prison because of his attempts to flee to the West. These days he tells his story while conducting bicycle tours through the capital. Sehr interessant! Copyright: Deutsche Presse Agentur [The German Press Agency]

Somewhere between 150,000 (according to police) and 250,000 (according to event organizers) took to the streets of Berlin to protest the Transatlantic Trade and Investment Partnership (TTIP). Read more here about the international Stop TTIP initiative.

Up till now, hundreds of thousands of refugees have been permitted to enter Germany. Now the German government has changed course by temporarily reintroducing border controls.

Alpine Lakes, a nature documentary, leads us into the fascinating world of deep mountain lakes. When winter comes and the lakes freeze over, the fish under the thick ice cover have different ways of passing the time.