Barotrauma is a co-op submarine simulator set in Jupiter's moon Europa's subsurface ocean. Your crew operates a submarine through procedurally generated cave systems filled with hostile alien creatures, completing missions between outposts. Every crew member has a specific role: Captain navigates, Engineer manages the reactor, Medic handles injuries, Security fights boarders, and Mechanic repairs hull breaches. The game shines in multiplayer chaos — someone accidentally floods a compartment, a creature breaches the hull, the reactor goes critical, and the Medic is administering the wrong drug — all simultaneously. Friendly fire and crew sabotage add human drama to the alien horror.
Boss fights are where Barotrauma tests everything you've learned. This guide covers strategies for bosses across all areas, organized by progression order. For general combat techniques, see our combat guide.
Boss Difficulty Overview
| Area | Difficulty | Recommended Build | Key Equipment |
|---|---|---|---|
| Europa | Easy | Engineer | SMG |
| Submarine Interior | Moderate | Engineer | SMG |
| Ruins | Hard | Captain | Revolver |
| Abyss | Very Hard | Captain | Revolver |
| Outpost | Extreme | Captain | Revolver |
Europa Bosses
Area difficulty: Easy Recommended level: All depths Recommended build: Engineer with SMG
Strategy
The first bosses teach core combat mechanics. Focus on learning patterns rather than dealing damage. The submarine has interconnected systems: reactor (power), engines (movement), pumps (water removal), weapons (turrets), and life support (oxygen) — this is your primary tool here.
Key tips:
- Don't rush. Learn the attack patterns first.
- Use submarine management to create safe windows.
- SMG is enough to handle everything here.
Submarine Interior Bosses
Area difficulty: Moderate Recommended level: All missions Recommended build: Engineer with SMG
Strategy
Early game bosses test your understanding of crew roles. Players who skipped learning this mechanic will hit a wall here.
Key tips:
- crew roles is critical for these fights.
- Farm SMG upgrades if you're struggling.
- Consider switching to Engineer if your current setup isn't working.
Ruins Bosses
Area difficulty: Hard Recommended level: Mid-late campaign Recommended build: Captain with Revolver
Strategy
Mid-game bosses are the major skill check. They combine multiple mechanics and punish players who rely on a single strategy.
Key tips:
- You need both submarine management and crafting mastery.
- Revolver makes a significant difference — get it before attempting these.
- See our combat guide for advanced techniques.
Abyss Bosses
Area difficulty: Very Hard Recommended level: Late campaign Recommended build: Captain with Revolver
Strategy
Late-game bosses are serious challenges. Build optimization matters as much as mechanical skill.
Key tips:
- Make sure your build is fully optimized.
- Revolver at max upgrade is recommended.
- Study each boss's attack patterns — most have 2-3 phases.
Outpost Bosses
Area difficulty: Extreme Recommended level: Between missions Recommended build: Captain with Revolver
Strategy
Endgame bosses are the ultimate test. They require mastery of all combat systems and an optimized build.
Key tips:
- Top-tier build with best-in-slot gear is mandatory.
- Master every mechanic — see our combat guide.
- These fights reward patience and pattern recognition above all else.
General Boss Tips
- Learn before you fight — Spend your first attempt observing attack patterns. Don't try to win on attempt one.
- Match your build — Some bosses favor certain builds over others. Don't be afraid to switch.
- Upgrade your equipment — A max-upgraded Revolver trivializes fights that seem impossible with weaker gear.
- Use submarine management — The core combat mechanic is your best defensive tool in every boss fight.
- Check the walkthrough — Our walkthrough tells you when you're ready for each boss.
More Barotrauma Guides
- Barotrauma Barotrauma Overview
- Barotrauma Best Builds
- Barotrauma Tier List
- Barotrauma Walkthrough
- Barotrauma Beginner's Guide
- Barotrauma Tips & Tricks
- Barotrauma Weapons Guide
- Barotrauma Combat Guide
- Barotrauma Maps & Locations
- Barotrauma Crafting Guide
- Barotrauma Classes & Characters
Similar Games
If you enjoy Barotrauma, check out these related guides:
- Palworld Boss Guide — survival game with similar mechanics
- Rust Boss Guide — survival game with similar mechanics
- ARK: Survival Evolved Boss Guide — survival game with similar mechanics
