"In the midst of a municipal swimming pool, the freediver Arthur Guérin-Boëri finds himself suffocating. His once spacious swim lane has now become a dead end. The French athlete, a multiple world champion in dynamic apnea, decides to escape the warmth of the pool and dive into the icy waters of a Finnish lake, seeking to set a new record. His daring journey then leads him to immerse almost naked under a block of ice, attempting to break another record in the frozen waters of a Canadian lake. In his quest for validation, which brings him perilously close to death several times, Arthur Guérin ultimately finds himself."

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