Corail noir is an album from the Aquablue series of comics (or Bandes dessinees), published in 1993 (ISBN: 2-84055-010-5.
Story
For the rebels of Aquablue, the hour of victory seems close. The compartments of the Mégophias provided them weapons in abundance. Even the giant tortoises flow again towards the archipelagoes...
They are unaware of the fact that their situation has never been so perilous. To ensure their supremacy on the planet, the leaders of Texec called upon the most powerful force Army: the Legion.
Vis-a-vis these over-equipped commandos, Nao and his adoptive people do not have any hope.
Their salvation can only come from the ocean floor, perhaps, where the ancestral legends take life in the half-light...
This may not be correct English, feel free to /msg me suggestions...