They are the guardians of our coasts, 150 large lighthouses that stand proudly along the French coastline. Discover in Thalassa the fabulous maritime epic of these sentinels who try to resist the wear and tear of time.

Indonesia is the largest archipelago in the world: 17,000 islands scattered between the Indian Ocean and the Pacific. The inhabitants of these far-flung lands, often isolated, have always lived with and for the sea. Some have remained attached to their traditions, others are irresistibly attracted by the "modern world" even if it means upsetting their lifestyles. They are the actors of the awakening of their archipelago. Thalassa went to meet them.

At sea, solidarity is not an empty word or a beautiful principle: it is a matter of course and very often a question of survival! This rule, long unwritten, is valid on all the seas of the world and in all circumstances. From MSF's hospital ship to offshore racing sailboats and the Rescuers at Sea - SNSM, Thalassa has chosen to dedicate an entire evening to those who live this generosity among seafarers on a daily basis.

Scientists, adventurers or tourists, they only dream of white. In France, this passion for the frozen and inhospitable worlds of the poles brings together the members of a very closed "club"! The Arctic and Antarctica have attracted and seduced very different personalities over the centuries. All of them paid with their lives, sometimes dearly, to gain access to these promised lands. Two very different worlds: in the North, the Arctic is an ocean of ice surrounded by continents, while in the South, Antarctica is a frozen continent surrounded by the sea.

Thalassa invites you to the south of France. We set off for Languedoc-Roussillon between the Pyrénées-Orientales and the gateway to the Camargue. It is a warm country where the lure of the Mediterranean has changed the landscape. On one side, the coastline bordered by its seaside resorts born 50 years ago, and on the other, a land of lagoons where small inland seas still keep secret unsuspected natural beauties. There is also a very old fishing tradition that is now endangered and chivalrous customs that are still very much alive in the heart of the Sète jousts.

With a strong character and a love of the ocean as their credo, they decided to live in this country that vibrates between the sea and the mountains. Five centuries ago, Basque fishermen went whale hunting on frail skiffs, harpoon in hand, today their heirs attack liquid mountains. Here we like to push our limits in all areas. Surfer of mythical waves, winemaker of the impossible, genius carpenter or fisherman, these women and men have chosen to bet on the energy of their native land. They symbolise the new Basque strength!

Perched on the Atlantic Ocean, 7 volcanic pebbles rise above the waves: this is the Canary archipelago shaped by nature and man. Hotspots for mass tourism for more than 50 years, these islands have become one of the most popular destinations in northern European countries. Far from the hordes of tourists and hotel bars, you will discover the hidden side of this archipelago, off the beaten track, only known by those who live in the shadow of volcanoes.

The Moon exerts a strong influence on the daily lives of humans and sets the rhythm of the lives of animals. Based on the latest scientific discoveries and technological advances with 3D images, the show allows you to travel to the four corners of the world to discover natural phenomena that are as incredible as they are mysterious. For example, once a year in Australia, some species of corals in the Great Barrier Reef lay eggs at exactly the same time. Farther on, on a beach on Christmas Island, crab females gather every year on a full moon night. In Mexico, we take a closer look at the pantagruelic feast of swordfish, which devour thousands of sardines, and then the "lunar wave" caused by the tidal heights in the Dordogne, in the bay of Mont-Saint-Michel, but also in India and Papua.

In 1936, for the first time in history, the Popular Front granted two weeks of paid leave to all French people. It was the beginning of a long love affair with the seaside! 80 years ago, when this right was invented, holidays were not a given...