The alien Neptuna loads with her spaceship OBO in the Baltic Sea to study the marine world. Here she meets seal Balty and seagull Ponto, with whom she learns a lot about the sea and our ecosystem.
In an ice cap maneuver, the Hydronica sinks. Arriving at the bottom of the sea, the Hydronauts discover that strange water bubbles rise from beneath them.
The alien Neptuna loads with her spaceship OBO in the Baltic Sea to study the marine world. Here she meets seal Balty and seagull Ponto, with whom she learns a lot about the sea and our ecosystem.
In an ice cap maneuver, the Hydronica sinks. Arriving at the bottom of the sea, the Hydronauts discover that strange water bubbles rise from beneath them.