Johan realises they've been searching in the wrong direction all along. He urgently redirects the search for his missing wife, which can resume after the storm has finally passed.
Tension mounts with two survivors telling conflicting stories. Who is to be believed? Meanwhile, the reconstruction of events continues, with one of the members of Polaris attempting to signal for help from a neighboring station.
Johan continues to drill Maggie for information on Annika's whereabouts. The summer team tries to find clues of what could have happened during the winter, unveiling a first possible suspect: Ramon, the winter cook.
Arthur reveals that the body they found buried in the snow doesn't belong to any of the Polaris VI. It appears to be from a failed mission that ended in tragedy.
A small scientific team remains isolated during the Winter at an Antarctic Research Station to continue their research in the fight against climate change. When spring comes, the entire team are either dead or missing
The survivors head to the burnt out station of Polaris V hoping to salvage communications equipment. But the mystery deepens. Did the death of a Polaris V scientist lead to the events of today?
As the Alexandria threatens to explode, the remaining scientists jump ship and onto the only life boat - putting them face-to-face with the real killer.
After breaking out of his confinement, Charlie cuts the ship's power once again and embarks on a murderous rampage. As Olivia finds herself one step closer to Rachel, Gloria pulls away from Wilde.
The crew lock Charlie in a cell accusing him of the murders; Arthur discovers a PBR on board, a machine that someone has introduced to steal the experiment.
Arthur is released from prison and continues his research in Point Nemo. There, scientists, including his daughter, have discovered an algae capable of slowing down climate change. However, a murder starts the nightmare all over again.