Subnautica: Below Zero
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About this mod

Slot Extender Zero allows you to use 12 upgrade modules simultaneously in the Prawn Suit and the Seatruck.

Permissions and credits

  • SlotExtenderZero adds (max. eight) extra upgrade module slots to the Prawn Suit and the Seatruck.
  • SlotExtenderZero also add two arm slot to the Seatruck.
  • SlotExtenderZero also add two extra chip slots to the Player.
  • SlotExtenderZero also add three upgrade module slots to the Hoverbike.
  • This mod is automatically compatible with all vanilla upgrade modules and should even be compatible with all modded upgrade modules for the Prawn Suit and the Seatruck.
  • Prawn Suit storage modules limited to four!
  • Slot ExtenderZero also adds extra QuickSlots for the extra slots. You can configure these keys from Main menu screen:
  • press enter to get console and enter 'sezconfig' command to get configuration window.
  • Default keys:
  • 'R' for Prawn storage access.
  • 'T' for Vehicle upgrade access.
  • 'Upgrade Slot 1-12 hotkeys' for Seatruck storage access (if there is a storage module).
  • '6,7,8,9,0,/,=' for extra module hotkeys.
  • The contents of all the upgrade slots, including the extra ones, is handled by the normal game save files.
  • Can change the slot layout to Circle and Grid (in mod configfile).


  • Simply extract the SlotExtenderZero archive into your QMods folder.


MaxSlots change process:
  1. remove all upgrade modules from all vehicles and save your game.
  2. exit game and open 'config.txt" (in the SlotExtenderZero's directory) via notepad.
  3. change MaxSlots to the desired value  (5 to 12).
  4. save the file.
  5. reload the game.