Watch Online Free on Watchseries. You can’t see them. You can’t hear them. And you never know exactly where they are. The life of submarines is secret and fascinating. In this film, we go inside one of the French navy's legendary vessels, the Rubis, and to where the next nuclear submarine, the Barracuda, is being built. From technological prowess to human exploits, the film submerges us in a timeless amphibian adventure.