Our Wives Under the Sea Ending, Explained: Leah's Transformation and Miri's Final Choice

⚠️ Spoiler Warning: This guide contains detailed spoilers for the entire novel. Proceed only if you've finished reading or are comfortable knowing the plot.

The Ending in Brief

In the final chapters, the novel splits between two perspectives. In Leah's account, she and Matteo surface from the deep after an encounter with a vast, unknowable creature. They turn the craft upward, clasp hands, and appeal to a being neither of them believes in to let them rise. The creature does not stop them, and they ascend through darkness toward the light. Leah thinks only of Miri and waits for the ocean to end.

In Miri's account, she and her sister Juna drive to their mother's house by the sea. Miri places Leah in a saltwater bath, and Juna tells her what she knows: when the craft surfaced, only Leah and one other crew member were aboard. Jelka died during the dive and her body was expelled from the craft while submerged. Miri carries Leah down a smuggler's path to the beach, wades into the sea, and releases her. Leah's body dissolves into the water.

The Climax: The Creature and the Ascent

The novel's climax is not a battle or a rescue but a surrender. After the submarine loses power and sinks beyond diveable depths, the crew—Leah, Matteo, and Jelka—are trapped in darkness. Jelka, increasingly disturbed by a voice she hears, eventually enters the escape trunk and is crushed by the pressure when the outer doors open. Her body is expelled from the craft. Leah and Matteo are left alone.

Leah then pilots the craft across the ocean floor, searching for something. She finds a chasm and, rising from it, a creature so vast it fills the windows. She writes her name in the logbook and presses it to the glass. The creature's eye holds her attention for hours. Eventually, Leah and Matteo decide to ask to surface. They turn the craft upward, hold hands, and pray to a being they do not believe in. The creature allows them to leave. Matteo holds Jelka's rosary beads during the ascent.

This moment is deliberately ambiguous. The creature never speaks or acts with clear intent. Leah cannot tell whether they were pulled down or pushed, whether the descent was intentional or accidental. The novel leaves open whether the creature is a god, a ghost, a natural phenomenon, or a projection of the crew's fear and isolation.

Character Outcomes

Leah returns home changed. She bleeds from her gums and pores, develops a silvery skin, craves salt, and eventually becomes translucent in water, able to breathe while submerged. Her transformation is physical and irreversible. In the final scene, she dissolves into the sea when Miri releases her.
Miri spends months trying to care for Leah, but the support systems around her fail. She finally chooses to let Leah go, carrying her into the ocean and releasing her. This is an act of love and acceptance, not abandonment.
Matteo surfaces with Leah but is not seen again in the present timeline. His fate after the return is left unresolved.
Jelka dies during the dive. Her body is expelled from the craft. Her sister Juna receives her effects after an altercation at the Centre, but the phone number she is given is disconnected.
Juna becomes a conduit for information. She tells Miri what happened and gives her a coat containing pages Leah wrote.

Resolved and Unresolved Threads

Resolved:

The question of what happened to the submarine is answered: it lost power, sank, and the crew encountered a creature. Leah and Matteo surfaced.
Jelka's death is explained.
Leah's transformation reaches its conclusion: she becomes something that belongs to the sea.
Miri makes a final choice about how to respond to Leah's condition.

Unresolved:

The nature of the creature is never explained. It may be a god, a ghost, a hallucination, or a metaphor.
Why the submarine lost power is never clarified. The crew notes that everything should have been working.
What happens to Matteo after the return is unknown.
Whether Leah's transformation is a blessing, a curse, or a natural consequence of deep-sea exposure is left open.
The Centre's role in the disaster is never fully investigated. Miri's attempts to get answers are met with automated phone systems and unhelpful reassurances.

Themes Resolved

The ending brings several of the novel's themes to a point of resolution, though not always a comfortable one.

Oceanic transformation is the central arc. Leah's body changes to become more like the sea—translucent, salt-hungry, able to breathe underwater. Her final dissolution suggests that the ocean claims what it touches. See the theme of oceanic transformation.
Failure of communication and support systems is dramatized in Miri's inability to get help from the Centre, the NHS, or even her friends. The novel ends with Miri acting alone, without institutional support. See the theme of failure of communication and support systems.
Ambiguous grief is resolved in a strange way: Miri does not lose Leah to death in the usual sense, but she loses her to transformation. The grief is real, but the object of grief is not a corpse. See the theme of ambiguous grief.
Limits of knowledge are emphasized throughout. Leah cannot know what the creature is; Miri cannot know what Leah experienced; the reader is left with uncertainty. The ending refuses to explain the inexplicable. See the theme of limits of knowledge.
Erosion of memory and identity is visible in Leah's