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This article contains information that is updated for the latest Experimental Version of Subnautica. Players using stable mode may find this information inaccurate.

The Seamoth Perimeter Defense System is a defense-oriented Upgrade Module for the Seamoth. The module is crafted in the Seamoth Modification Station and must be applied to the Seamoth's upgrade panel to function.

The Seamoth Perimeter Defense System is used by left clicking after selecting the icon with one of the hotkeys (1-4). The hotkey used depends on where the module is placed in the upgrade panel. If the left mouse button is clicked the Seamoth will generate a small charge that uses 1% of the Seamoth's energy. If the left mouse button is held a large radius blast can be produced that uses up to 30% of the Seamoth's energy. The blast can either stun or kill Fauna depending on the intensity and number of the charges.

Installing multiple Seamoth Perimeter Defense System allows blasts to be fired off in quicker succession.

The Seamoth Perimeter Defense System does not affect the Ampeel. This is most likely because the Ampeel is also electrically oriented.

The Seamoth Perimeter Defense System is capable of fending off Reaper Leviathans with only minimal damage to the hull.

Recipe

PolyanilineItem ArrowSeamoth Modification StationItem ArrowSeamoth Perimeter Defense System

Gallery

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