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Chapter 1: Endurance

Episode number: 1

Overview: On the shores of Cape Mercy, a skillful group of teen divers investigate a series of secrets and signs after one of their own mysteriously goes missing.

Chapter 2: Flower of the Sea

Episode number: 2

Overview: While the town searches for Lauren, Dive Club begins their own investigation. Izzie finds Lauren's phone, which contains a hidden message suggesting her disappearance was no accident.

Chapter 3: The Rising Sun

Episode number: 3

Overview: The girls break into Lauren's house looking for more information and find an old coin belonging to Hayden. Izzie finds a diamond brooch in Lauren's wetsuit.

Chapter 4: SS Gothenburg

Episode number: 4

Overview: Dive Club discovers that Hayden's coin has some significance and that Lauren was communicating with a mysterious person named LK

Chapter 5: The Adelaide

Episode number: 5

Overview: It's the day of the cabaret fundraiser and Dive Club discover who the mysterious LK is.

Chapter 6: Dimitri Donskoii

Episode number: 6

Overview: Dive Club and LK receive a distress call and embark on a rescue mission. Could it be Lauren?

Chapter 7: Mary Celeste

Episode number: 7

Overview: With the town of Cape Mercy believing Lauren is dead following the discovery of her sailing jacket, a memorial is held in her honor.

Chapter 8: RMS Republic

Episode number: 8

Overview: Dive Club and Leonid dive the dangerous Russian shipwreck causing dire consequences.

Chapter 9: Nemesis

Episode number: 9

Overview: Dive Club learns the significance of Hayden's coin, which takes them on another wreck dive.

Chapter 10: Admella

Episode number: 10

Overview: Viktorya shares a family secret with Anna. Hayden tells Henry he's found a way to pay off his debts. Izzie steps up her relationship with Henry and Maddie finds a painting that changes everything.

Chapter 11: Black Swan

Episode number: 11

Overview: The Salvation Day celebrations begin, and the town is in good spirits. All that changes when a SOS flashes out from the lighthouse. Is it Lauren?

Chapter 12: Queen Anne's Revenge

Episode number: 12

Overview: The truth is pieced together as one of the girls is forced to choose between friends and family.