Shown from the perspective of a young submariner with unusually sensitive hearing and uncannily precise sound recognition. The fate of many often depends on his ability, and one time, whilst highly stressed, he makes a incorrect call which put his entire crew in mortal danger. Trying to regain the confidence of his comrades, he conducts an unauthorised investigation of an apparent plot which, it turns out, risks escalating into a nuclear apocalypse. Suddenly working under pressure with the fleet admiral, they must do whatever is necessary, even the unthinkable, to prevent a nuclear war, since a confirmed nuclear strike order cannot be countermanded.
François Civil
as Chanteraide
Omar Sy
as D'Orsi
Mathieu Kassovitz
as Alfost
Reda Kateb
as Grandchamp
Paula Beer
as Diana
Alexis Michalik
as Second SNLE-B2R
Jean-Yves Berteloot
as Commander CIRA
Damien Bonnard
as Navigation officer SNLE
Pierre Cevaer
as Sonar watchman SNA
Sébastien Libessart
as Cadet SNA
Paul Granier
as Table operator SNA
Etienne Guillou-Kervern
as Plant master
