The Lost Islands

I have hoped all these last years to see The lost Islands, again. I was so excited when I saw the DVD in a big famous shop in Paris. The adventures of the five children who find themselves in an island where are living people like 200 years ago are still impassioning. Like another commentator, my only regret is that it is obvious that a second season was previous and not shoot. I could not find any comment about the film, The Lost Islands (with the same cast), that was released in Australia in 1975. Does anyone know something about it ? I would be so pleased to see it as well. Anyway thanks to the Australian channel who produced this wonder and to the French DVD distributor for having bought the rights of it and made The Lost Islands not lost anymore. Merci