Obo the computer is not working: Balty and Ponto have emptied the fresh water tanks on board the Hydronica while playing. And without Obo, the voyage ...
Balty is caught in a drift net. How can he free himself? “Wait until the net floats up to the surface” advise the fish. But Balty can’t wait that long...
Salmon really are surprising fish! They travel up rivers to lay their eggs where they were born. They find their way by tasting the water. But the sal...
Rudy the young porpoise has lost his mother. He has tried calling her, she cannot hear him over the noise of the boats. Luckily our heroes are there t...
The crew of the Hydronica are confronted with an oil slick: the birds can’t fly anymore, the starfish can’t breathe… the oil must be stopped from spre...
Our heroes meet some starving snails. They cannot find the seaweed they feed on. The natural environment appears completely disorganised. How will the...
Paul the emperor penguin needs the Hydronauts help. He is injured and cannot take care of his egg any more. A father who incubates eggs? Ponto is amaz...
Sharks are terrifying animals. And Balty is not going to argue. When he and Neptuna meet Paulo, the hammerhead shark, Balty flees. But when he leaves ...
The energy stone that makes Obo the computer work has disappeared. Neptuna and her friends must replace it so that they can continue on their voyage. ...
Leon, the cleaning fish, lives on a coral reef. Like many species, he finds what he needs to live there. But the fish have left the reef and Leon is a...
Tamara the turtle is lost: she left to lay her eggs on the beach and has not returned to the water at nightfall. Theo, her husband, asks the Hydronaut...
The Hydronica has broken down at the bottom of the ocean. How can it be fixed if nobody can go outside because of the water pressure? Especially as ou...
The manatees are very greedy animals. So when Johnny the young manatee falls ill, Neptuna and her friends think it is simply indigestions. But when al...
The whales seduce each other by singing. But our heroes are there to help him compose his song. And when Barnaby and his girl end up beached, Neptuna ...
The Hydronauts meet Corky, a killer whale. But Corky is not like all the others. He once lived in an amusement park and does not know how to survive o...
Because the ice is melting and hunting is difficult, Albert the polar bear and come to look for food on board the Hydronica. He scares the crew. But w...
The coral are preparing for a mysterious event. All would be going well if Ponto was not having such a run of bad luck. Whatever he does, he does some...
It is not only Ponto and Balty who like playing hide and seek. Some little marine animals hide under driftwood to protect themselves from predators. W...
The Hydronauts want to watch the right whales. But they are hiding, scared by too many gulls in the area. How can the whales and gulls be reconciled? ...
Dolphins live as a group so that they can better protect their young from the dangers of the sea. Not only do they protect their young, they can also ...
Balty is determined he has seen a ghost. On board, nobody believes him, especially not Ponto! Everybody knows there’s no such thing as ghosts! But wha...
Ponto and Balty are fighting, they each want their own space. A bit like the crocodiles… While Neptuna helps Jonas the crocodile find a new territory,...
The Hydronauts meet Otto, the ranger in an enormous forest of seaweed. But Otto looks after the forest on his own. It’s far too much work! Neptuna and...
Ponto is sure that today Balty will meet the mammal of his life. While looking for her the Hydronauts meet many marine animals, but not a single mamma...
Neptuna has lost her memory. Obo does not have a single remedy for her. A fish tells them that seahorses can cure numerous illnesses. What luck, there...
Balty is sure of what he has heard: Neptuna wants to return to her planet without telling them! When Ponto thinks he has seen another spaceship, he is...
