Surge Jelly

Defensivelargeherbivore

Attitude

Defensive

Depth

0–350m

Scan Time

Overview

The Surge Jelly (*Staurobrachia capacitor*) is a large defensive creature found in the Observatory Ruins across a wide depth range of 0–350m in Subnautica 2. Unlike colonial Earth jellies such as the Portuguese man-o'-war, the Surge Jelly is a single complex animal with tissue specialization far exceeding anything found in terrestrial cnidarians.

Habitat

Observatory Ruins0–350m

Behavior & Details

The Surge Jelly's primary defense is a powerful electric discharge delivered through two rigid fins containing wirelike electrocytes — structures evolved from ancestral tentacles. These organs generate between 400 and 1,000 volts at 1 ampere, which is more than sufficient to kill a human. Despite this lethal capability and a classified herbivore diet, the Surge Jelly uses its electrical system defensively rather than for active hunting.

The creature's internal anatomy is surprisingly complex: an outer bell ringed with sense organs (rhopalia) coordinates swimming through a nerve net, while a retained stalk — a remnant of its growth from a clonal stack — draws in nutrients for the visible gut structure. Traces of radioactivity, high-temperature waxes, and sulfuric acid in its tissues indicate prior contact with hydrothermal vents, suggesting the Surge Jelly originates from much deeper water than its current 0–350m patrol range.

Tips & Strategy

The Surge Jelly outputs 400–1,000 volts at 1 ampere — lethal to unprotected divers. Maintain at least 10 meters of clearance when swimming near one. The electric discharge has no visible warning animation beyond fin positioning.

Surge Jellies are defensive, not aggressive. They will not chase you, but their wide 0–350m depth range means you can encounter them at almost any depth in the Observatory Ruins. Always scan your vertical surroundings.

Electrical equipment may behave erratically near Surge Jellies. If your scanner or base systems glitch in the Observatory Ruins, check for nearby Surge Jellies before assuming hardware failure.

Surge Jellies that cluster together communicate via electric fields. Groups are more electrically active than isolated individuals — give clustered Surge Jellies wider clearance than solitary ones.

Traces of hydrothermal chemicals in their tissues suggest Surge Jellies migrate from deep ocean vents. Encountering them in unusually shallow water may indicate nearby volcanic or thermal activity worth investigating.

PDA Entry

PDA // Databank

Surge jelly (tentatively Staurobrachia capacitor). Large, complex jelly that hunts with electric shocks. 1. Single animal Unlike colonial organisms such as the Portuguese man'o'war, the surge jelly is a single animal with specialized tissues—far *more* specialized and complex than Earth jellies. Proposed class name: staurobrachia (pole arms). 2. Complex internal structure Outer bell ringed with sense organs called rhopalia. A nerve net coordinates the bell's motions to swim and seek prey. The visible inner structure is the gut. 3. Feeding structure The jelly retains its stalk — a remnant of its growth in a stack of clones. The stalk draws in nutrients for the gut. 4. Charged fins Two rigid fins contain wirelike electrocytes, likely a development of ancestral tentacles. These organs build voltage to stun or kill prey. Measured power ranges from 400 to 1000 volts at 1 ampere: enough to kill a human. 5. Peculiar passengers Traces of radioactivity, high-temperature waxes and sulfuric acid imply contact with a hydrothermal vent. Composition of the jelly's tissues suggest origins in the deep ocean. 6. Former domestics? Jellies in close proximity communicate through their electric fields. Whether jellies have individual names or a grammatical language is purely speculative, but some patterns may be trained or learned—even passed down through generations of jellies. Assessment: minor danger in close contact. Fascinating research prospect from a distance.