Propulsion Cannon

Lore & Background

Designed for the harsh conditions of a high-pressure ocean world, the Propulsion Cannon represents standard survival engineering adapted for aquatic environments. While originally part of the broader technological suite available on interstellar vessels like the Aurora, survivors must often reconstruct it from scratch using scavenged resources. Its design prioritizes efficiency and power density, allowing a single user to exert force equivalent to heavy machinery.

In the lore of 4546B, the device highlights humanity's struggle against nature rather than domination over it. It does not kill; it displaces. This distinction is vital in an ecosystem where violence often provokes worse responses from apex predators. The Cannon allows for non-lethal deterrence and environmental manipulation, fitting into a survival philosophy that values caution as much as firepower.

Some theories suggest the magnetic technology utilized here shares roots with the propulsion systems found on alien structures scattered across the seabed. However, human versions are crude compared to the seamless integration seen in ancient ruins, reflecting the desperate ingenuity of stranded crew members trying to reclaim agency over their surroundings.

In Their Own Story

The pressure gauge flickered red as Ryan surfaced near a narrow canyon entrance. A massive rock blocked the only path forward, and behind him, the telltale chittering of Crabbits echoed in the dark water. He didn't have time to mine it out with a scanner or pickaxe. Grabbing his Propulsion Cannon from the utility belt, he aimed at the boulder.

The device hummed, blue energy crackling against the murky green water. With a sharp exhale, he fired. The magnetic pulse latched onto the stone, and with a violent shove, the rock slid sideways into the current, revealing a dark tunnel. Before the debris settled, he sprinted through, leaving the snapping claws of the swarm behind him in the safety of the cavern.

Reader's Guide

The Propulsion Cannon is crafted using Titanium, Lithium, Glass Fiber, and Gold at a Fabricator. It requires an equipped Rechargeable Battery to function, draining power with each shot.

To use it, aim at a target object or creature. Firing launches the object away from you, while holding can sometimes pull lighter items closer depending on the specific game version mechanics. This is ideal for moving path-blocking rocks or pushing aggressive fauna like Crabbits or Stalkers out of your immediate vicinity.

Be aware that larger creatures, particularly Leviathans, are immune to its effects and will not be launched by the beam. Battery management is critical; conserve shots during combat encounters rather than spamming them. Always keep a spare battery on hand when exploring deep zones where predators are common.

Did You Know?

• The Cannon requires Gold to craft, making it unavailable until players reach deeper biomes or salvage specific wrecks.
• It is one of the few tools that can interact with both static objects and living creatures simultaneously.
• In Subnautica: Below Zero, the device functions identically but is often crafted earlier due to resource accessibility.
• The blue energy signature emitted by the Cannon matches the aesthetic of many alien technologies found on 4546B.

Gameplay Mechanics and Modes

In Subnautica, players assume the role of Ryley Robinson, navigating a vast, open-world ocean planet known as 4546B from a first-person perspective. The core loop involves surviving against alien flora and fauna while gathering resources to craft tools, build bases, and construct submersibles for deeper exploration. The environment features a dynamic day-night cycle and frequent eclipses that drastically alter visibility, adding tension to underwater traversal. Players can choose from four distinct difficulty settings: Survival mode requires managing hunger, thirst, health, and oxygen; Freedom mode removes survival needs but keeps other challenges; Hardcore mode introduces permanent death with no respawn or low-oxygen warnings; and Creative mode unlocks all blueprints and provides immediate access to advanced tools like the propulsion cannon, stasis rifle, and mobile vehicle bay without resource constraints. The game also supports virtual reality headsets, offering an immersive experience where players can utilize keyboard, mouse, or controller inputs to interact with the alien ecosystem.

Narrative Arc and Lore

The story unfolds roughly a millennium after an alien race called the Architects attempted to cure the devastating Kharaa bacterium by studying the Sea Emperor Leviathan. Their desperate efforts to extract Enzyme 42 from related species led to a catastrophic facility collapse, releasing the pathogen into the ocean and forcing the Architects to upload their consciousnesses while quarantining the planet. Centuries later, the spaceship Aurora crash-lands on 4546B, leaving Ryley Robinson as the sole survivor after his rescue attempt by the Sunbeam is intercepted by an automated Quarantine Enforcement Platform. As Ryley explores the ruins of previous expeditions and Architect facilities, he discovers the last Sea Emperor, who communicates telepathically. By helping her hatch eggs using a synthesized enzyme recipe, Ryley triggers a massive release of Enzyme 42 that cures him and neutralizes the bacterium. This act allows him to disable the planetary blockade and construct an escape rocket, concluding his journey as he leaves the dying Sea Emperor behind.

Development History and Release

Subnautica was announced by Unknown Worlds Entertainment in late 2013 and entered early access on Windows in December 2014, followed by macOS and Xbox One releases. The game officially exited early access for PC and Mac in January 2018, with physical console editions published by Gearbox Publishing arriving later that year for PlayStation 4 and Xbox One. Expanding its reach, the title launched on Nintendo Switch, PS5, and Xbox Series X/S in May 2021, with a dedicated Nintendo Switch 2 version following in February 2026. The game achieved significant commercial success, selling over five million copies by early 2020 while garnering generally positive critical reception. Its development timeline also includes the release of Subnautica: Below Zero as a standalone spin-off in May 2021, which was initially conceived as downloadable content. A direct sequel, Subnautica 2, subsequently entered early access on May 14, 2026, continuing the franchise's legacy.

Key Tools and Environmental Interaction

Survival on planet 4546B relies heavily on the player's ability to interact with the environment through crafted technology. A standout tool is the Propulsion Cannon, which serves as a vital utility for navigating the dense underwater terrain by launching players or objects across distances. This device is notably included in the starting inventory of Creative mode alongside other powerful items like the Seaglide and stasis rifle. In standard survival modes, players must scavenge resources to unlock blueprints for such equipment, emphasizing the game's progression system where exploration dictates capability. The open world design encourages players to build mobile vehicle bays and stationary bases to expand their reach into deeper, more dangerous zones. Whether managing oxygen levels in Hardcore mode or freely crafting without limits in Creative mode, the interplay between resource management and tool usage defines the player's ability to overcome the planet's hostile wildlife and environmental hazards.