In the south of France, in Toulon, a team of cave divers explore the « Saint-Antoine » spring. Behind a sump, they discover a mysterious drowned gallery, with collapsed wood beams and planks. The gallery being very unstable, it is considered too dangerous to be explored by divers. This is where the BlueROV2 comes in !
With the help of the divers, it’s going to discover this strange gallery …
If you don’t speak French, it’s about a French navy project, just after world war 2. An attempt to create an underground military base, a project that could have succeeded if fate had decided otherwise …