A great graphic adventure game set underwater. You will need all your intelligence, ingenuity, tricks, and a good diving suit to discover and solve the mystery of Atlantis. A thousand dangers await you in this search the legendary sunken city! If you succeed, you may find wealth, glory, and freedom.
Originally only listed here for CPC, according to one of the authors the game was also available for ZX Spectrum, Oric and Thomson M05; see his page here.
An unofficial translation in English is also available.
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Some good graphics for 1985. Not the best game, but a lot of puns french people born back in the 60s or 70s can understand and enjoy.
Seeing Fred's comment a while ago reminded me of this one.
Amazing hi-res graphics at the time, but still quite fun today.
For the non-French speakers out there, I have created an English translation of the Thomson MO5 version, which can be found here: https://tinyurl.com/4f7eeer4