S1 • E1
Abigail, an oceanologist, is sent by IFREMER on a mission to Fécamp, which she left a few years earlier following a personal tragedy. She must investigate the inexplicable sinking of the Rose Davies, one of her father's trawlers with 14 sailors on board. While she conducts her search to find the wreck with Constable Prigent, mysterious phenomena occur at sea.
S1 • E2
Navigation is prohibited after a container ship veers off course and hits an unknown obstacle. Abigail, who alerted the authorities to the risks of navigation, faces the anger of the fishing community, including her father, Henri, and Julien, her husband and father of the child they lost. Abigail's stepson, Jimmy, witnesses a strange luminescent phenomenon on the sea.
S1 • E3
Abigail is reeling from Prigent's death, swept away by the explosion of one of the First World War bombs lining the seabed. And Sylvia, his sister-in-law, an environmental activist he had been tailing, is in a coma. Defying the ban on going out to sea, the scientist returns to the water to understand and record the seismic activity present in the fault off the coast of Fécamp.
S1 • E4
Soldiers, led by Commander Calderi, have invaded the port of Fécamp. With the help of Jimmy and his accomplices, Axelle, Youssef, and André, Abigail tries to identify the source of electromagnetic disturbances in the sea, and the strange luminescence observed by Jimmy.
S1 • E5
Diving into the rift, Abigail discovers that an unknown creature haunts the bay of Fécamp, unable to bring herself to abandon her dead child in the fishermen's nets. The town speaks of the presence of a monster in the bay, and Pierre, a sailor, hatches a plan to catch the "monster."
S1 • E6
Abigail must complete this adventure: help the creature separate from its young and leave the bay. But the army plans to capture it. With the help of André, Axelle, Youssef, and Julien, she develops a plan to save the creature.
Abigail
Julien
Henri
André
Pierre
Axelle
Jimmy
Laurent
Joanne
Sylvia