How to Create and Modify the Subnautica Seamoth

Exploring the expansive water worlds of Subnautica without a good submarine is next to impossible despite how great a swimmer you might be. You’ll need a safe and versatile exploration vehicle that is as fast as it is useful. This is where the Subnautica Seamoth comes in.

The Seamoth gives you a wieldy one-person under water vehicle that can move very fast under water. This will come in handy when racing against time, running away from a monster or simply hustling around to explore more space in limited time.

Like almost everything in Subnautica, you will need some blueprints and fabrication components to build yourself a Seamoth over at the Mobile Vehicle Bay. You will need more custom components like the Seamoth torpedo, pressure compensator and access to the Vehicle Modification Station over at Moonpool to give more functionality to your Seamoth.

subnautica seamoth fabrication blueprint and upgrades

Moonpool is your sea base that docks undocks and customizes the Prawn Suit and the Seamoth. You will need the Habitat Builder to generate it. Remember that getting a Power Cell Charger will charge your Seamoth faster at the Moonpool. Also, put some decent space between the Moonpool and the sea floor to avoid crashing your Seamoth into the sea floor when you eject.

What Do You Need to Build the Subnautica Seamoth?

Before you can start working on the Seamoth, you’ll first have to use your scanner to find three Seamoth Fragments. These broken fragments will form the basis of your creation. The Subnautica Seamoth fragment locations are among the many wrecks scattered around the Aurora and the Grassy Plateaus.

The other ingredients you’ll need to fabricate the Seamoth include:

  • Titanium Ingots (You can use the fabricator to convert titanium into titanium ingots)
  • A Power Cell (You’ll need some batteries and silicon rubber to fabricate power cells) The power cell drives your Seamoth and you can recharge it by docking to the Moonpool
  • Glass (You will need some quartz and the fabricator to create your glass)
  • Lubricant (There are different ways to create this basic material. Try a Creepvine seed cluster in the fabricator for quick results)

Once you have all the needed ingredients, you can head over to the Mobile Vehicle Bay to create your Seamoth.

Subnautica Seamoth Customization and Upgrades

While the Seamoth is a formidable vehicle straight off the factory, you will need to do some customizations over at the Vehicle Modification Stations to push it to its limits. The upgrade console lets you basic changes like color swaps and naming the vehicle to crafting upgrade modules. The Seamoth upgrades to look out for include:

Storage Module

Want more storage space on your Seamoth? Try the storage module upgrade. It will give you 4×4 storage units that can fit into the four slots in the submarine.

Hull Reinforcement

Accidents and collisions aren’t unheard of when exploring. The Hull Reinforcement permanently hardens your chassis before a collision hence reducing or eliminating damage after an accident.

Seamoth Solar Charger

One of the biggest issues you will have to face when riding the Seamoth is the range. Your power cells need power to drive the thrusters, the lights, equipment and life support. You will run out of juice soon and have to race back to the Moonpool for a recharge. The Seamoth Solar Charge makes things easier by giving you a system that will recharge your batteries whenever the Seamoth is in the sun hence reducing your reliance on Subnautica cheats.

Pressure Compensator Kit

The next most important upgrade that will push your exploration deeper is the pressure compensator. The basic Seamoth can dive up to 200 meters before giving you the maximum depth warning. Staying at maximum depth renders a steady 7% per second hull damage. A series of pressure compensators will increase your depth.

  • Pressure Compensator MK1 (300 meters)
  • Pressure Compensator MK2 (500 meters)
  • Pressure Compensator MK3 (900 meters)

Energy Efficiency Module

The Energy Efficiency Module will wring more distance off your power cells by recycling heat produced when running engines and other systems and injecting it back into the power system. A single module will cut down your power consumption by an impressive 15 percent.

Seamoth Sonar

This is a purely explorative piece that displays topographical data to your HUD. It will give your missions more purpose and make it easier to discover items when exploring.

Seamoth Offensive and Defensive Upgrades

Every explorer needs some bit of protection from the wild worlds they’ll dive into. The Seamoth has some protective and offensive measures that will come in handy.

  • Seamoth Perimeter Defense System generates an electric field that will repel offensive creatures
  • The Torpedo System is an offensive weapon that will either fire Gas Torpedo or Vortex Torpedo at a target

Using the Subnautica Seamoth

If using the native controls, the LMB will get you into the Seamoth. Use your swimming controls to steer the Seamoth, RMB to toggle the headlights on or off and E to exit the vehicle.

Other tricks to get power to the Seamoth include swapping the power cell with a fresh one or docking at Cyclops to take on more power.

The Seamoth’s life support system generates oxygen without consuming any Energy. The submarine must however have energy to do this. Quite confusing, huh?

Diving too deep or being involved in attacks from hostile creatures and crashing the Seamoth will take a toll on the Seamoth’s health bar. Use the Repair tool to fix this before it reaches 0% (the vehicle will explode)

The Seamoth will also take damage when riding the acidic brine of the Lost River or when in temperatures higher than 70 degrees centigrade.

Top speed on forward thrust is 12.7 m/s while lateral speed hits 11.3 m/s.  You can hit higher speeds by moving diagonally and using both lateral and forward thrusters to hit a 17 m/s speed. You, however, won’t see clearly due to an obscured field of view.

Beware that the Seamoth retains its momentum once you exit it when it isn’t at a full stop and might drift away from you leaving you vulnerable.