Another post showed Tønnesen behind the camera, pretending to film, saying: “Current mood: Re-living season two, waiting for season three.”
One fan responded: “I just loved this cast, I want them all in little boxes, without viruses and without rain.”
Viewers were sad to hear the third series will be the final one, but they are excited to find out if a cure is discovered.
The official Instagram account posted a behind the scenes teaser made up of clips of all the cast members on set.
The clip said: “The end is just the beginning, but every beginning must have an end.”