A french submarine is stuck in a crisis situation where Commandant Grandchamp, second-in- command D’Orsi and acoustic analyst Chanteraide extricate themselves from the problem. Chanteraide hears a peculiar sound which he can't determine and almost leads to the destruction of their operation. Amid international crisis and defying the orders from his superiors, the determined analyst uses his intuition to find the sound which could lead his country into the brink of an apocalypse.
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