Polaris is a french roleplaying game, set in a far future (post-apocalyptic) science-fiction universe.
It focuses primarily on underwater life, and it's mood is something like the movie 'Abyss' or 'The Hunt for Red October'...
A nuclear war completely devastated and ruined the surface of the earth, turning it into a permanent nightmare. There is still human life in the underground cities, in the depth of the oceans and in the human settlements in solar system (the moon, Mars, etc...).
Some centuries later, civilization is reborn underwater, and there is new nations, new political struggles and competition between the cities which grow on the bottom of the seas...
As the ice of the poles partly melted, some of the ancient coastal cities are now underwater and some of the ancient technologies may be found in those (dangerous and radioactive) places...
Elsewhere, there is normal humans using old technologies, like submarines and underwater suits ; there is also new cyborgs adapted to this watery milieu ; and some geneticians from the most advanced countries even achieved to create true biological hybrids who can breathe water and live under very high pressure... There is also a lot of mutations in every species, because of the radioactivity...
The scenarii ranges from action and exploration to political/diplomatic games...