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.
Combat in Barotrauma rewards knowledge over reflexes. Understanding how each mechanic works — and how they interact — is what turns a struggling player into a dominant one. New here? Start with our beginner's guide for the basics.
Core Combat Mechanics
1. submarine management
The submarine has interconnected systems: reactor (power), engines (movement), pumps (water removal), weapons (turrets), and life support (oxygen). Damage to any system cascades — losing power stops pumps, flooding shorts electrical systems, and hull breaches let water and creatures in. Managing these systems under pressure is the core challenge.
Why it matters: This is the foundation of all combat. Everything else builds on this.
2. crew roles
Each role has unique talents and responsibilities. The Captain drives and navigates. Engineers manage the reactor output (too high = meltdown, too low = no power). Medics craft medical supplies and treat injuries. Security officers man turrets and fight boarders. Mechanics repair hull breaches and maintain systems.
Why it matters: The most underrated mechanic. Players who master this early have a massive advantage.
3. crafting
Fabricators aboard the sub create weapons, medical supplies, tools, and equipment from raw materials. Medics craft drugs and bandages. Engineers craft tools and components. Materials are purchased at outposts or looted from wrecks. Crafting between missions prepares you for the next mission's dangers.
Why it matters: Unlocks a new layer of gameplay depth once understood.
4. underwater creatures
Europa's ocean is full of hostile alien life. Mudraptors board the sub through breaches. Husks infect crew members, turning them against others. Molochs are massive creatures that damage the hull. Endworms are the apex predator — encounters with them are desperate survival situations.
Why it matters: The tactical edge that separates average players from advanced ones.
5. mission system
Missions are taken at outposts with varying objectives: escort, salvage, monster hunting, exploration, and cargo delivery. Difficulty and reward scale with depth — deeper missions face stronger creatures and harsher pressure. The campaign progresses through a series of outpost stops across Europa's ocean.
Why it matters: The endgame optimization mechanic. Small improvements here compound into massive gains.
Mechanic Synergies
Understanding how mechanics interact is where real optimization happens:
submarine management + crew roles
The submarine has interconnected systems: reactor (power), engines (movement), pumps (water removal), weapons (turrets), and life support (oxygen). When combined with crew roles, each role has unique talents and responsibilities. This combination is the core of every effective build.
crafting + underwater creatures
Fabricators aboard the sub create weapons, medical supplies, tools, and equipment from raw materials. Paired with underwater creatures, europa's ocean is full of hostile alien life. This is why the tier list favors builds that leverage both.
mission system as a Multiplier
Missions are taken at outposts with varying objectives: escort, salvage, monster hunting, exploration, and cargo delivery. Difficulty and reward scale with depth — deeper missions face stronger creatures and harsher pressure. The campaign progresses through a series of outpost stops across Europa's ocean. This system amplifies everything else — the better your mission system optimization, the more your other mechanics pay off.
Combat by Build
Each build approaches combat differently:
Captain (S-Tier)
Combat approach: Stay at the navigation terminal, chart safe routes through cave systems, call out threats on sonar, and coordinate crew during emergencies. Key equipment: Revolver Primary mechanic: submarine management
The Captain navigates, sets heading, and commands the crew. Full setup in our builds guide.
Engineer (S-Tier)
Combat approach: Monitor reactor output constantly, adjust for power demand, repair electrical systems, and prevent meltdowns during combat. Key equipment: SMG Primary mechanic: crew roles
Engineers manage the reactor — the submarine's heart. Full setup in our builds guide.
Medic (S-Tier)
Combat approach: Craft medical supplies between missions, treat injuries immediately during combat, and manage drug interactions to avoid overdoses. Key equipment: Stun Baton Primary mechanic: crafting
Medics treat injuries (bleeding, bone fractures, organ damage), cure diseases, and craft medical supplies. Full setup in our builds guide.
Security Officer (A-Tier)
Combat approach: Man turrets during creature encounters, grab weapons during boarder events, and patrol the submarine for threats. Key equipment: Harpoon Gun Primary mechanic: underwater creatures
Security Officers man turrets, fight creatures that board the sub, and handle hostile crew in multiplayer. Full setup in our builds guide.
Mechanic (A-Tier)
Combat approach: Respond to hull breaches immediately, weld repairs under pressure (sometimes while the compartment floods), and maintain mechanical systems between emergencies. Key equipment: Railgun Primary mechanic: mission system
Mechanics repair hull breaches, fix mechanical systems, and maintain the submarine's physical integrity. Full setup in our builds guide.
Advanced Combat Techniques
Damage Optimization
- Match your equipment to your build's stat priorities
- Exploit submarine management for maximum damage windows
- Chain crew roles and crafting for combo damage
- Use underwater creatures to create openings
Survivability
- Learn enemy patterns before committing to attacks
- The reactor is the most important system. If it overloads, the sub explodes. Keep reactor output at or slightly above current power demand. Never leave it unattended during combat.
- Position using submarine management to control spacing
- Save defensive options for guaranteed survival, not comfort
Boss Combat
Bosses test your understanding of every mechanic. See our boss guide for fight-specific strategies.
- Phase awareness — Most bosses change behavior at health thresholds
- Patience over aggression — One extra hit per opening beats dying to greed
- Build preparation — Swap gear and equipment for specific fights when needed
Common Combat Mistakes
- Button mashing — Committed attacks have recovery frames. Mashing locks you into animations.
- Ignoring crew roles — This mechanic exists for a reason. Players who use it take significantly less damage.
- Wrong equipment for the situation — Check our weapons guide for situational picks.
- Not learning from deaths — Every death teaches something. If you don't know why you died, you'll die the same way again.
- Overcommitting — Trading hits works in Europa but will get you killed in Outpost.
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 Boss Guide
- Barotrauma Maps & Locations
- Barotrauma Crafting Guide
- Barotrauma Classes & Characters
Similar Games
If you enjoy Barotrauma, check out these related guides:
- Palworld Combat Guide — survival game with similar mechanics
- Rust Combat Guide — survival game with similar mechanics
- ARK: Survival Evolved Combat Guide — survival game with similar mechanics
