Mare Sargassum

Expedition chainHigh Security Low Security Null Security Rogue Drones

An expedition — a multi-part escalation chain (typically four sites) obtained by chance (~5%) from an unrated complex, tracked in The Agency. Each completed part has roughly a 50% chance to continue, usually toward lower-security space than where it began.

Quick answers Access NPC roster Payout Go deeper Escalations Sources

Quick answers

Where is the Mare Sargassum in EVE Online?

The Mare Sargassum spawns in high-sec, low-sec and null-sec. How you find it: escalation only — cannot be scanned down.

What spawns in the Mare Sargassum?

The Mare Sargassum has 12 waves and about 66 NPCs: 1 cruiser, 20 destroyers and 45 frigates. Killing the trigger ship spawns the next wave; the triggers are Strain Infester Alvi, Sentient Alvi, Sentient Shatter/... Alvior and Sentient Ripper/... Alvior and others.

Does the Mare Sargassum escalate?

The Mare Sargassum is itself an escalation from Desolate Site.

What does the Mare Sargassum drop?

Faction/commander drops scale with the chain's depth; the fourth site carries the headline table.

Access C Single-source / unverified

Ship restrictions: Unknown

NPC roster C Single-source / unverified

Community-maintained wave list from the site's own wiki page — counts and triggers vary between spawns; treat as the shape, not gospel.

Part 1 — Initial defenders 3 ships

Qty	NPC	Hull
4-6	Sunder/... Alvi	F
0-2	Strain Infester Alvi TRIGGER	F
1	Sentient Alvi Drone components, can also drop Astero chip TRIGGER	F

Part 1 — Reinforcement wave 2 ships

Qty	NPC	Hull
3-4	Devilfish/... Alvi	F
3-4	Ripper/Shatterer Alvior	D

Part 1 — Wave #2 1 ship

Qty	NPC	Hull
4	Barracuda/Devilfish Alvi	F

Part 1 — Wave #3 1 ship

Qty	NPC	Hull
2	Silverfish Alvi	F

Part 2 — Initial defenders 3 ships

Qty	NPC	Hull
9-10	Decimator/... Alvi	F
3-6	Predator/... Alvior	D
1	Sentient Shatter/... Alvior Drone components or Astero chip TRIGGER	D

Part 2 — Timed Wave 1 ship

Qty	NPC	Hull
3-4	Hunter/... Alvi	F

Part 3 — Initial defenders 4 ships

Qty	NPC	Hull
5	Raider/... Alvi	F
0-2	Strain Infester Alvi	F
2-3	Marauder/... Alvior	D
1	Sentient Ripper/... Alvior Drone components or Astero chip TRIGGER	D

Part 3 — Wave 2 2 ships

Qty	NPC	Hull
4	Barracuda Alvi	F
4	Predator/... Alvior	D

Part 4 — Initial defenders 2 ships

Qty	NPC	Hull
4	Raider/Hunter Alvi	F
1	Strain Splinter/... Alvi	F

Part 4 — Timed Wave 2 ships

Qty	NPC	Hull
3	Hunter/Silverfish Alvi	F
4	Marauder/Dismantler Alvior TRIGGER	D

Part 4 — Reinforcement Wave 2 ships

Qty	NPC	Hull
2	Hunter/... Alvi	F
2	Marauder/... Alvior	D

Part 4 — Reinforcement Wave 1 ship

Qty	NPC	Hull
1	Rogue Mining Overseer T2 Salvage	C

Payout C Single-source / unverified

Faction/commander drops scale with the chain's depth; the fourth site carries the headline table.

Go deeper

Hunting the Drudge Factory (Expedition chain) Loose Ends (Expedition chain) Menacing Mechanics (Expedition chain)

Escalations

Escalates from: Desolate Site

Sources

EVE University wiki: Combat site C Single-source / unverified retrieved 2026-08-19
EVE University wiki: Mare Sargassum C Single-source / unverified retrieved 2026-08-26

Last reviewed 2026-08-19 · game version: Cradle of War (Jun 2026). Spot an error? Corrections land fastest via the channel.