Crabsquid Subnautica — Spawns, EMP Attacks & How to Survive

The Crabsquid is an aggressive deep-sea predator in Subnautica that lives in the Deep Grand Reef, the Northern Blood Kelp Zone and the Lost River. It has 500 HP, slashes for 40 damage, and its signature move is an EMP blast that temporarily drains vehicle and seabase power whenever it gets near a light source. The good news: turn your lights off and stay above its attack ring, and it's one of the most manageable threats in the deep. This guide covers every spawn location, exactly how the EMP works mechanically, and the full list of countermeasures.

Here's what you'll learn:

• All Crabsquid spawn biomes and where they lurk in each
• Exactly how the EMP works (batteries, oxygen, and the horizontal ring)
• Every countermeasure, from lights-off to Creature Decoys
• Crabsquid eggs, Alien Containment, and the bioreactor value

Official resources: Steam store page · Official Subnautica Wiki — Crabsquid · IGN Subnautica page

What Is the Crabsquid?

The Crabsquid looks like a comb jellyfish wrapped around a squid — a translucent bulbous sac over a hard brown-green mantle, four large blue eyes, and ten limbs tipped with small fins, with a pair of small pincers near its mouth. It's a carnivore with an aggressive attitude, active both day and night (cathemeral). Official wiki stats:

Per the official Subnautica Wiki — Crabsquid: "Rays and other illuminated herbivores are its usual prey, and it will approach and attack any light source in the vicinity. Its EMP blast was likely developed as a response to predation by creatures with electrical hunting mechanisms."

Where to Find Crabsquids

The official wiki lists three biomes — and you'll visit all three on the story path:

The Deep Grand Reef is the worst hotspot: community reports describe 3–4 Crabsquids swarming the 500 m Degasi base at once (see the Steam discussion). Gamepressure's biome guide notes a large group patrols the Deep Grand Reef near the entrance to the Lost River. In the Lost River they overlap with Ghost Leviathan juveniles and Warpers — see our Lost River guide and Warper guide for those.

How the Crabsquid's EMP Works

The EMP is triggered by light, not by you. Any light source — vehicle headlights, Seaglide, flashlight, flares, base floodlights — attracts the Crabsquid, and when it gets close it releases a ring-shaped EMP that:

• Drains affected Batteries and Power Cells to 0% temporarily (restored after a few seconds)
• Stops vehicle oxygen production while drained — this is the killer at depth
• Flickers seabase power off briefly

Two mechanical details worth knowing:

• The blast is a horizontal ring. Community testing (Reddit) confirms the EMP propagates sideways — if you drive above or below the Crabsquid, you're outside the ring.
• The Prawn Suit is a permanent target. It's the only vehicle whose lights can't be turned off, so it always provokes the EMP response.

The most common death from Crabsquids isn't the claw attack — it's the EMP cutting O₂ in a deep Cyclops while you can't move. A Reddit thread documents exactly that scenario at 600 m: power drained, oxygen stopped, lights off didn't help because the EMP had already been triggered.

How to Deal With Crabsquids

Every countermeasure, roughly in order of practicality:

1. Turn your lights off. Seamoth, Cyclops and Seaglide headlights all provoke the EMP. Lights off, they largely ignore you.
2. Go up or down. The EMP ring is horizontal — break line-of-sight vertically.
3. Keep moving. They're slow swimmers (slightly slower at night while docile), so a moving Seamoth outruns them easily.
4. Knife them. Two hits with the Survival Knife — or one with the Thermoblade — makes them flee for a few seconds.
5. Throw a Creature Decoy. They'll chase the decoy instead of you.
6. Drop flares. Crabsquids attack the flare's light rather than you — a classic decoy trick.
7. Hold a fish. If they grab you with a fish in hand, they eat the fish and you take no damage; their aggression drops briefly.
8. Stasis Rifle + knife. Freeze them and swim past — the guaranteed-safety option.
9. Seamoth Perimeter Defense System. The shock drives them off your vehicle.
10. Don't build near them. A base or floodlight near a Crabsquid means constant EMP flickers — they attack the light, not you.

Crabsquid Eggs, Alien Containment & the Bioreactor

Crabsquid eggs spawn in the Deep Grand Reef and Northern Blood Kelp Zone (official wiki), incubate in 1 day in an Alien Containment, and hatch into Crabsquids that do not attack the player — but still use their EMP in response to submersible lights, so keep your lights off near your base pets. The Alien Containment guide covers the hatchery setup.

For power, though, skip the pet: a whole Crabsquid in the Bioreactor gives 770 energy — one of the best single-item fuel sources in the game, well above most fish. If you're running a deep base on the bioreactor (see our Multipurpose Room and base power guide), a single hunting trip to the Deep Grand Reef stocks the reactor for a long time.

FAQ

Where do Crabsquids spawn in Subnautica?

The Deep Grand Reef (around the 500 m Degasi base), the Northern Blood Kelp Zone and the Lost River Corridor / Ghost Canyon. Their eggs also spawn in the Deep Grand Reef and Northern Blood Kelp Zone.

How much damage does a Crabsquid do?

Each claw slash deals 40 damage, but the real threat is the EMP blast, which drains nearby vehicle and base power to 0% temporarily and stops vehicle oxygen production while drained.

Can you kill a Crabsquid?

Yes — it has 500 HP. Two knife hits (or one Thermoblade hit) make it flee for a few seconds, and a Stasis Rifle + knife combo kills it reliably. Most players just avoid them instead.

Why does my Seamoth keep losing power near Crabsquids?

Their EMP blast is triggered by light sources. Your Seamoth headlights are the trigger — turn them off near Crabsquids and the EMP won't fire.

Can you tame a Crabsquid?

Hatch a Crabsquid egg in Alien Containment and the adult won't attack you — but it still EMPs any light source nearby, so keep it away from your base's floodlights.

Related Guides

• Subnautica Lost River — Map, Entrances & Resources
• Subnautica Grand Reef — Biome Guide
• Subnautica Warper — Behavior & Survival
• Subnautica Alien Containment — Hatching Guide

Last updated: August 13, 2026.