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The seamoth submersible is a fast, safe mode of transport, but remember that swimming is fantastic for your glutes and endorphin levels.

PDA, Dialogue


The Seamoth is a small one person submarine that is constructed using the Mobile Vehicle Bay. Due to the fact that it can be customized with a Moonpool and a Vehicle Modification Station, the Seamoth is very versatile.

Before the Seamoth can be constructed, the player will first need to find and scan three Seamoth Fragments using the Scanner.


Upon entering the Seamoth, the player's Oxygen stores will be replenished, unless the Seamoth is depleted of Energy. This enables the player to dive into deeper areas of the ocean that are not easily accessible by swimming or by using the Seaglide. However, if the Seamoth is out of energy, the oxygen within the Seamoth will slowly run out, until the point where the player is losing oxygen within the Seamoth.

The Seamoth has an energy supply that needs to be maintained by replacing the Power Cell on its back. Alternatively, the Seamoth can be charged when docked to the Cyclops or to a Moonpool.  Doing so will drain energy from the respective unit. On one full charge, the Seamoth can travel approximately 10,650 meters (106.5m per percentage of energy) before the power cell must be replaced. 1% of the submersible's energy is expended for every 18 seconds that the player remains in the vehicle, even if the player is not in motion during that time.

The Seamoth's health, separated from the player's own, will decrease if it is attacked by hostile creatures or crashed into objects (including some plants) in the environment, or crushing from pressure. The damage can be repaired via the Repair Tool, if the player has one. As of the Seamoth Update, once its health reaches 0%, the Seamoth will explode.[1]

Compared to the Cyclops and the Prawn Suit, the Seamoth is significantly faster, making it excellent for exploration. However, it is also more prone to damage, and even a fully upgraded Seamoth cannot explore the deepest biomes (That being the Inactive and Active Lava Zones).

The Seamoth's headlights can be toggled with the right mouse button on PC.

Upon entering the Seamoth, it says "Welcome Aboard Captain."

Hazards Edit

The Seamoth can be harmed or destroyed by colliding with the terrain and by surpassing the crush depth limit. Many Fauna including the: Reaper Leviathans, Bonesharks, Crashfish, Crabsnakes and Drooping Stingers can all be considered serious threats towards the submersible. Also, large groups of Biters can attack the Seamoth, dealing minor damage.

Thrust Edit

The Seamoth produces enough forward thrust to travel at a maximum speed of about 12.7 m/s, and enough lateral thrust to travel at about 11.3 m/s. By rotating the Seamoth diagonally off-course and thrusting both forward and laterally, speeds close to 17 m/s can be attained. While useful, this method of travel can be hazardous, since the player's field of view will be reduced in the direction of travel.

When exited, the Seamoth will preserve its momentum and place the player in front of itself; this can lead to a high loss of health or death should the vehicle be going at high speed as it rams into the player. Always stop the Seamoth before exiting to avoid this problem.

Upgrades and Customization Edit

The Seamoth can be customized with the Vehicle Modification Station. The console allows the Seamoth to be named and its colours changed. The console also crafts upgrade modules for the Seamoth. Up to four of these modules can be applied to the upgrade panel found on the Seamoth's left wing.

Seamoth Pressure Compensator Mark 1

Pressure Compensator

The Seamoth has a crush depth of 200 meters. 20 Meters before the player reaches the crush depth a warning will appear letting the player know that it is approaching. Below 200 meters the on-board AI will state:

"WARNING: Maximum depth reached, hull damage imminent".

At that depth the Seamoth will take hull damage at a constant rate of about 7% per second. It is possible to increase the Seamoth's crush depth adding Pressure Compensator upgrade. These upgrades do not stack and can be further upgraded by Modification Station.

Influence of Depth
Pressure Compensator Crush Depth
None 200 meters
Pressure Compensator MK1 300 meters
Pressure Compensator MK2 500 meters
Pressure Compensator MK3 900 meters
Seamoth Storage Solution

Storage Module

The Storage Module upgrade for the Seamoth provides 4x4 storage compartment, which can be add up on each 4 slots on the Seamoth.

Seamoth Hull Reinforcement

Hull Reinforcement

Permanently hardened chassis before collision, eliminating damage under normal conditions.

Seamoth Power Efficiency Module

Engine Efficiency Module

The Engine Efficiency Module recycles heat by-product to minimize power inefficiencies. Each module reduces power use by 15%.

Seamoth Solar Charger

Seamoth Solar Charger

The Seamoth Solar Charger is an upgrade module that enables the player to recharge their Seamoth's battery while in the sun.

Seamoth Perimeter Defense System

Seamoth Perimeter Defense System

Generates a localized electric field designed to ward off aggressive fauna.

Seamoth Torpedo System

Torpedo System

A standard underwater payload delivery system adapted to fire torpedoes:

Seamoth Sonar

Seamoth Sonar

A dedicated system for detecting and displaying topographical data on the HUD

Recipe Edit

Titanium IngotPower CellGlassGlassLubricantArrow-right (1)Mobile Vehicle BayArrow-right (1)Seamoth

Data Bank Entry Edit

The seamoth is a one-person vehicle with an independent, replaceable power cell and a fully customizable design. Low power, multi-directional thrusters enable it to function equally well in sea or space environments. Most long-range vessels carry at least two vehicles of this class to facilitate the exploration and exploitation of small astronomical bodies.

The Seamoth: It goes anywhere but land.


  • Top Speed: 13m/s
  • Acceleration: 5m/s/s
  • Distance per power cell: 10km
  • Crush depth: 200m below sea level
  • Upgrade module slots: 4
  • Dimensions: 3m x 1.5m x 1m
  • Persons: 1

Seamoths may be modified by installing upgrade modules to the access point mounted on the upper left wing. These include:

  • Increased cargo storage
  • Superior power
  • Pressure and collision compensation
  • Enhanced sonar
  • Defensive capabilities

NB These modules may only be manufactured at a moonpool outfitted with a vehicle modification station.

Cargo Hauler: 3x storage; 1x solar charger Scout: 1x pressure compensator; 1x engine efficiency; 1x perimeter defense; 1x sonar; Tank: 1x perimeter defense; 1x torpedo system; 2x hull reinforcement

Gallery Edit

For a more complete gallery, visit Seamoth/Gallery.

Trivia Edit

  • The old Seamoth Pressure Compensator has the same crush depth of a Cyclops Ultra Hull Reinforcement Module. However, it is now unobtainable, having been replaced by the Pressure Compensator, and cannot be upgraded. If a player has one, it is considered a separate item from the Pressure Compensator.
  • The Seamoth's AI used to occasionally say "I love it when you come inside me" instead of "Welcome aboard, Captain." This was a joke slipped in by the sounds producer, Simon Chylinski. After discussing the line with the dev team, Simon removed it as a lot of minors and families play Subnautica.

References Edit

  1. Dated June 24, 2015.