Barotrauma is a co-op submarine survival sim about keeping a fragile vessel alive under Europa’s ice. You steer, repair, treat injuries, run the reactor, fire turrets, complete jobs for outposts, and try to reach the next dock with enough crew and supplies left to keep going.
content warning: this mature guide discusses survival horror, creature attacks, combat, gore-tagged storefront metadata, and medical systems in non-graphic terms.
This is a beginner guide for first campaigns in single-player, hosted co-op, or a small friend crew. Barotrauma itself is demanding, but the scope here is beginner: learn the ship, divide work clearly, choose manageable early routes, and avoid disasters that wipe new crews before the game has time to teach them.
Essential Tips
1. Pick Clear Roles Before Undocking
Barotrauma gets chaotic when everyone tries to do everything. Before leaving an outpost, decide who is steering, who is watching the reactor, who is ready for repairs, who handles medicine, and who mans guns when sonar contact turns hostile.
Small groups can double up, but the responsibility still needs a name. A two-player crew might run Captain plus Mechanic, then use bots for medical and engineering support.
2. Use Bots to Cover Missing Work
Bots are not a replacement for communication, but they keep a short crew from collapsing. In single-player, you manage the sub and AI crew yourself. In multiplayer, bots can supplement the player count.
Give bots simple, durable tasks: repair leaks, fix electrical systems, operate weapons, or clean up after fights. Do not assume they will solve every emergency alone. Check their orders after docking, after a death, and after any major repair.
3. Start With Safer Missions
Early campaigns are about cash, reputation, and learning the boat. Cargo work is usually the simplest mission category because the crew mainly needs to move crates intact to the destination. Salvage pays better but asks you to leave the sub or retrieve marked items, which raises risk. Monster and combat work can go wrong fast for a new crew.
Take one or two manageable tasks, complete the route cleanly, then spend the reward on fuel, medical supplies, ammunition, and repairs before choosing harder work.
4. Drive Like the Hull Matters
The submarine is your lifeline. Fast piloting feels efficient until the nose hits terrain, leaks spread through multiple rooms, and the crew is fixing the ship while enemies close in.
Use sonar carefully, slow down near tight passages, and call out hazards before they become collisions. A cautious Captain saves more time than a reckless one because fewer stops are spent welding the hull back together.
5. Repair Leaks Before Chasing Side Tasks
Flooding changes everything. It slows movement, damages systems, blocks access, and can turn a minor creature hit into a full round loss. When water enters the ship, Mechanics and nearby crew should prioritize hull breaches, then pumps, then damaged devices.
Everyone should know where diving gear, welding tools, and fuel tanks are stored. A player who cannot find gear during a breach is not really available for the emergency.
6. Keep the Reactor Stable
Power failure can make a safe route dangerous. The Engineer should watch reactor demand, electrical damage, junction boxes, and battery support instead of leaving the power room unattended for every small distraction.
If the lights flicker or systems fail, tell the crew what is happening. Barotrauma punishes silent problems because the Captain may keep driving, Security may keep firing, and the Mechanic may be fixing the wrong room while the grid falls apart.
7. Treat Medicine as Crew Infrastructure
Medical play is not just healing after fights. The Medical Doctor diagnoses afflictions, chooses treatment, manages limited supplies, and keeps people alive long enough for the sub to dock.
New crews should avoid casual use of medicine and keep basic treatment items organized. When someone is hurt, call the injury and location instead of running through the ship silently. A medic who knows where to go saves time and supplies.
8. Communicate Every Major Change
Barotrauma is built around overlapping systems. A creature contact, empty ammo loader, broken pump, low fuel rod, flooded junction room, or missing cargo crate matters to more than one person.
Short callouts work best: contact direction, leak room, turret ammo state, patient location, and mission item status. Long debates during emergencies bury the useful detail.
9. Spend Outpost Time Deliberately
Outposts are the reset point between danger zones. Before undocking, repair the ship, restock critical supplies, hire crew if needed, check mission options, and consider shipyard upgrades.
Do not rush the next route just because everyone survived. A damaged submarine with empty cabinets is already halfway to losing the next trip.
10. Be Careful With Default-Sub Advice
Several vanilla submarines were reworked in the 2026 summer update, and a hotfix followed soon after. Treat older layout tips, bot-pathing comments, and exact upgrade priorities as potentially stale until you confirm them in your current build.
The safe beginner rule is broader: learn the boat you are using. Know ballast access, reactor location, gun coverage, medical storage, diving gear, pump rooms, blind spots, and the fastest path to each hull section.
Crew Roles and First Jobs
Captain is the organizer and pilot. The Captain should drive, pick routes, announce contacts, and keep the crew focused.
Engineer keeps power online. Stay near the reactor and electrical rooms unless a larger emergency needs every hand.
Mechanic handles hull breaches, machinery damage, mining, and mechanical fabrication. If the ship is flooding, the Mechanic is usually one of the first people moving.
Security Officer protects the sub from outside and inside threats. New Security players should learn turret arcs, ammo handling, and when to leave the gun to repel an intruder. Shooting well matters less than staying calm and preserving ammunition.
Medical Doctor is harder than it looks because wrong treatment wastes limited supplies. Keep the cabinet organized and learn common status effects gradually.
Assistant is a flexible training role: carry tools, help repairs, move cargo, follow the Mechanic, and fill whichever job is overloaded.
Campaign Priorities
Your first campaign goal is not perfect efficiency. It is building a repeatable loop: pick a destination, choose manageable missions, undock with supplies, survive the passage, dock safely, then upgrade and restock.
Prefer shorter routes while learning navigation and repairs. Choose missions that match the crew’s confidence. Cargo runs teach docking, storage, and route discipline. Salvage teaches leaving the sub and returning with marked items. Monster missions test guns, sonar, repairs, and medical readiness at the same time.
Money should first protect the loop. Fuel, welding supplies, ammunition, medicine, and hull repairs beat flashy purchases.
Reputation matters over time, but beginners should not chase every faction opportunity at the cost of ship safety.
Submarine Survival Habits
Learn storage before danger starts. Every regular crewmember should know where diving suits, oxygen tanks, welding tools, fuel, ammo, medical supplies, and mission cargo are kept. A shared mental map cuts panic.
Close doors behind floods when it is safe. Compartment control buys repair time, especially if one room is breached and the rest of the ship is still dry. Do not trap crewmates, but do slow the spread.
Pair outside work with communication. When someone exits for salvage or repairs, the crew should know who is outside, what they are doing, and when they are coming back.
Watch ammunition and power during fights. A turret is only useful if it has ammo and the grid can support the fight. Security and Engineering should talk before and during extended contacts.
After every emergency, reset the ship. Refill oxygen, replace tools, repair devices, drag loose cargo back, check patient status, reload weapons, and confirm the mission item is still aboard. The second crisis is often deadly because the first one left the ship disorganized.
Common Mistakes to Avoid
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Do not undock without assigning jobs - A vague crew wastes the first emergency deciding who should respond.
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Do not take the hardest-looking mission first - Early success comes from completing routes, not proving the crew can survive every threat.
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Do not ignore small leaks - Minor flooding can become a shipwide repair spiral when another hazard arrives.
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Do not leave the reactor unattended for every noise - Power stability is a survival task, not background flavor.
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Do not hoard medical supplies in random pockets - The medic needs predictable storage when people start dropping.
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Do not fire every gun blindly - Ammunition and firing arcs matter, especially on longer routes.
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Do not leave divers outside without a clear plan - The submarine can drift, fight, or flood while someone is still away from the airlock.
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Do not trust old submarine layout advice blindly - Current builds may differ after reworks and hotfixes.
Summary
| Category | Top Tip |
|---|---|
| Crew | Assign clear duties before launch |
| Missions | Start with lower-risk work and build confidence |
| Piloting | Slow down before tight terrain and call hazards early |
| Repairs | Fix leaks and pumps before side tasks |
| Power | Keep reactor and electrical systems watched |
| Medicine | Organize supplies and call patient locations |
| Outposts | Restock, repair, and upgrade before the next route |
| Updates | Recheck exact submarine advice after major patches |
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7 checked for this guideEvery factual claim in this guide was checked against at least two independent sources before publication. These are the references used for Barotrauma.
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