Oceanic Versus Cosmic Exploration: The Circular Voyage of In Ascension
Introduction
In Ascension by Martin MacInnes constructs a bold thematic parallel between the exploration of the deep ocean and the conquest of outer space. Rather than presenting these as separate frontiers, the novel argues that both environments reveal the same fundamental truth: life is a circular, self-creating process that dissolves individual identity into a continuous cycle of transformation. The journeys of protagonist Leigh Hasenbosch—first into an enigmatic Atlantic vent, then toward the Oort cloud, and finally back to a drowned Earth—mirror one another, suggesting that the universe’s greatest mysteries lie not in distant stars but in the primordial waters from which all life emerged. This analysis traces the claim across three key plot phases, connecting characters and symbols to illuminate the novel’s rich complexity.
1. The Deep-Sea Vent: The Unknowable Interior
The novel opens on the research ship Endeavour, where Leigh investigates a deep-sea vent that defies known oceanography. This vent—suddenly measured at twelve kilometers and later appearing to extend two hundred kilometers—becomes a symbol of the unknowable substrate beneath familiar surfaces. The submersible Scintilla, designed as a precursor to off-world probes, loses contact after reaching record depth, and crew members fall mysteriously ill. Stefan, the expedition leader, urges secrecy before disappearing, presumably drowned.
Leigh’s personal history intertwines with this maritime mystery. Born in Rotterdam below sea level, she experienced a near-drowning vision as a child, an event that recurs as she feels “drawn back to the ocean.” Her abusive father Geert and her mother Fenna’s retreat into mathematics frame the ocean as both refuge and threat. The vent itself—a rupture in Earth’s crust—parallels the psychic rupture of Leigh’s trauma. The deep-sea vent thus becomes a charged symbol: a portal to the planet’s interior, echoing the way childhood wounds remain buried yet potent.
What emerges from this phase is a sense that the ocean holds secrets that resist human comprehension. The false depth readings and magnetic disturbances hint at a reality that cannot be mapped or controlled—a theme that will resurface in space.
2. The Cosmic Journey: Building on Oceanic Models
Leigh’s transition to space exploration appears at first to be a logical progression. She joins ICORS in California, developing algae for deep-space missions. The algae is not merely a food source; it is a living archive of early life, carrying the genetic heritage of Earth’s first organisms. Leigh’s research emphasizes that the cell is an “ocean capsule,” preserving the original marine environment. This idea directly bridges the two realms: the same primordial chemistry that birthed life in ancient seas now sustains travelers in the void.
The Datura object—an artificial interstellar artifact with carved markings that vanished—provides the propulsion breakthrough for the Proscenium 1 mission toward the Oort cloud. Leigh trains with Tyler and Karius under the leadership of Uria, enduring brutal simulations and water survival exercises that echo her childhood submersion. The mission’s stated goal is to intercept Voyager and contact the entity behind Datura, but the deeper impulse is to discover origins—both cosmic and biological.
Yet the cosmic journey is marked by decay. The crew’s health deteriorates; the algae exhibits hypergrowth, spreading through the ship like a living organism. Tyler accidentally cuts his arm, and radiation events coat Nereus in black dust. Leigh’s flashbacks to her father’s violence intensify, suggesting that the trauma of origin cannot be escaped by leaving Earth. The cosmic voyage becomes an introspective descent into the self—a mirror of the vent exploration.
3. The Return: Ocean Engulfed
The final chapter, “Ascension,” reunites the two strands. Leigh returns to an Earth entirely submerged—continents gone, the planet a blue star. The capsule splashes down into an ocean that has claimed everything. Tyler and Karius die; their bodies are consumed by algae that grows from within them. Leigh performs a final act of liberation: she sheds her suit, opens the hatch, and dives into the ultramarine water. The novel concludes with her merging into “life-filled” waters, feeling “glad to be a part of this.”
Meanwhile, Leigh’s sister Helena journeys to Ascension Island, a former military outpost and terraforming experiment. There she witnesses green turtles nesting—ancient creatures returning to the same beach where they were born. The turtles embody the circularity that the novel champions: a journey outward that is always a return. Helena’s search for truth about Leigh leads her not to a definitive answer but to an experience of awe that dissolves her own certainties.
The complexity here is profound. The space mission, launched with dreams of reaching new worlds, ends not with discovery of an alien intelligence but with a return to a radically transformed ocean—the original womb and tomb. The Datura object’s purpose remains ambiguous; it may have been a lure, a test, or simply a natural phenomenon. What matters is the insight that the ocean is both alpha and omega: the source of life and its final repository.
Character and Symbol Connections
- Leigh Hasenbosch: Her arc from marine microbiologist to astronaut to oceanic dissolution embodies the thematic claim. Each stage deepens her understanding of life as a continuous cycle rather than a linear progression. Her near-drowning as a child prefigures her final dive; the vent’s unknowability mirrors space’s emptiness; the algae that consumed her crewmates also sustains her.
- Helena: As the grounded sister, she pursues facts and legal justice. Yet her experience on Ascension Island—watching turtles, decoding the island’s terraformed history—teaches her that meaning lies in immersion, not explanation. Her perspective complicates the notion that spaceflight is the ultimate horizon.
- Fenna and Geert: The parents represent opposing responses to mystery: Fenna’s mathematical withdrawal and Geert’s violent control. Leigh’s journey is an attempt to transcend both, embracing uncertainty rather than dominating or escaping it.
- Algae: The most versatile symbol. It links Earth’s first life to space travel, serves as food and air scrubber, and ultimately consumes the dead. It represents the blurring of self and environment—the dissolution that Leigh finally accepts.
- Deep-sea vent: A rupture in the planet’s crust that reveals the interior’s strangeness. It foreshadows the cosmic ruptures of Datura and the final drowning.
- Green turtles: Ancient navigators that return to their origin. They mirror Leigh’s own journey and reinforce the theme of circularity.
- Datura object: An alien signal that draws humanity outward, yet its purpose remains opaque. It functions as a narrative MacGuffin that forces characters to confront their own assumptions about exploration.
Complexity and Contradiction
The novel resists a simple resolution. The cosmic mission does not answer fundamental questions; instead, it returns to a world where the ocean has erased human infrastructure. The “listener” may be the ocean itself, or life’s self-organizing principle, not a discrete entity. Leigh’s death/transformation is ambiguous—is it a triumph of symbiosis or a surrender? The novel suggests both. Furthermore, the space program is funded and driven by corporate entities (Cable International) that exploit both ocean and space for resources. This adds a political dimension: exploration is never innocent; it is entangled with extraction and control. Yet the novel also celebrates the sublimity of the unknown, leaving the reader with a sense of wonder that transcends critique.
Study Questions and Answers
1. How does the deep-sea vent function as a symbolic precursor to the space mission?
The vent’s unknowable depth and the loss of communication with the submersible Scintilla prefigure the uncertainties of the Oort cloud journey. Both environments resist human mapping and control, forcing characters to confront the limits of knowledge. The vent also physically connects to the idea of a planetary interior, just as space exploration probes an exterior—but both ultimately lead back to the ocean.
2. What role does algae play in linking oceanic and cosmic exploration?
Algae represents first life on Earth, provides sustenance for the space crew, and eventually consumes the dead bodies of Tyler and Karius. It embodies the circularity of life: what was generated in ancient seas now sustains life in space, and when that life ends, algae reclaims it. The algae garden on Nereus is a living capsule that mirrors the cell-as-ocean-capsule concept Leigh articulates earlier.
3. How does Leigh’s childhood trauma connect to her explorations?
Her near-drowning vision and her father’s violence create an unresolved relationship with submersion and loss. In both the vent dive and the space flight, she relives a sense of dissolution. The final dive into the flooded Earth becomes a conscious embrace of that trauma, transforming it from a source of fear into a means of connection.
4. What is the significance of the green turtles on Ascension Island?
The turtles return to the same beach where they hatched, illustrating the circular journey that defines the novel. They also represent ancient, non-human ways of knowing—magnetic navigation, generational memory—that contrast with the technological ambition of space travel. Their presence grounds Helena’s search in a biological reality that transcends human narratives.
5. Does the novel endorse oceanic exploration over cosmic exploration, or does it suggest they are equivalent?
The novel presents both as complementary rather than equivalent. The ocean remains the origin and end point, while space is a detour that reveals the ocean’s primacy. However, the detour is necessary: without the space journey, Leigh would not have gained the perspective to recognize the ocean’s depth. The two modes of exploration are inseparable in her arc, and the novel’s power lies in holding them together as a single, circular voyage.