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In Subnautica Survival mode, your first objective is not to reach the deepest water. Build a safe routine around the starting lifepod: collect basic materials, secure food and water, craft the Scanner and a standard O₂ tank, then make short dives that end while your oxygen reserve is still comfortable. Add the Survival Knife, Repair Tool and Fins as resources allow. Scan unfamiliar objects, repair the lifepod, and use its radio signals to choose the next nearby destination. This low-spoiler approach teaches the map and unlocks progression without turning every early trip into an emergency.
Know what Survival mode is asking you to manage
Subnautica is an open-world underwater survival game. In Survival mode, four systems are always competing for your attention: health, hunger, thirst and oxygen. Exploration and crafting are connected to those needs; you gather materials and food so you can stay out longer, while new tools let you reach and understand more of the world.
The Tool Desk
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This guide assumes Survival mode. Other modes can remove food and water requirements, so a checklist that says “carry a meal and water” is specifically for Survival. Oxygen and safe movement still matter whenever you are diving.
Your first-dive route, step by step
Use the Safe Shallows around the starting lifepod as a training ground. The area gives you room to learn movement, visibility and the return route before depth and unfamiliar terrain add pressure.
#1 Best Overall
- Descend into the depths of an alien underwater world filled with wonder and peril
- Craft equipment, pilot submarines and out-smart wildlife
- Explore lush coral reefs, volcanoes, cave systems, and more
- Underwater survival and exploration
- Orient yourself at the lifepod. Look back toward it after every short excursion. Treat the pod as both a landmark and a navigation reference until the surrounding layout becomes familiar.
- Make a small resource loop. Swim out, collect a few basic raw materials and catch fish, then return. Do not commit to a distant point of interest on your first trip.
- Prepare food and water. Turn your catch into supplies before leaving again, and keep a reserve in storage or your inventory. A dive that is safe for oxygen can still become dangerous if hunger or thirst is ignored on the way home.
- Craft the Scanner first when possible. It lets you identify and record unfamiliar flora, fauna, fragments and wreck items, which expands your understanding and unlocks blueprints.
- Add a standard O₂ tank. The tank extends the time available for each descent and gives you more margin to return to the surface.
- Collect materials for the remaining early tools. Craft a Survival Knife, Repair Tool and Fins as soon as the required resources are available. You do not need every item before making another short loop; add them in the order that supports your next task.
- Scan on the way out and back. Stop for a few targets rather than trying to catalog everything in one dive. If you are unfamiliar with an object, scanning is usually more useful than passing it by.
- Return before the final oxygen warning. Start ascending while your reserve is comfortable. The trip back takes time, and a tunnel, slope or detour can make the surface farther away than it looked.
- Repair the lifepod. Use the Repair Tool on damaged systems so the pod can support continued exploration. After that, listen for radio signals and follow nearby points of interest at your own pace.
Craft these tools in a practical order
Early crafting is less about collecting a complete set and more about removing the biggest limits on each trip. The following order balances information, time underwater, harvesting, equipment recovery and movement.
| Tool | What it changes | Best beginner use |
|---|---|---|
| Scanner | Records unknown objects and contributes to blueprint progression | Scan flora, fauna, fragments and wreck items during every short loop |
| Standard O₂ tank | Increases available dive time | Spend longer in the Safe Shallows without making oxygen the immediate constraint |
| Survival Knife | Enables harvesting actions and gives you a basic defensive option | Gather useful materials and avoid being helpless when something approaches |
| Repair Tool | Restores damaged equipment and systems | Repair the lifepod before relying on it as your continuing base of operations |
| Fins | Improve swimming mobility | Shorten the time spent travelling between a resource and the surface |
Material availability determines the exact order after the Scanner and O₂ tank. If a tool requires a resource you have not found, keep making shallow collection loops instead of forcing a dangerous trip to obtain it.
Manage oxygen as a hard limit, not a warning to ignore
Every dive has a finite return journey. Oxygen is the hard limit because the surface, a vehicle or another air source must be reached before the reserve is exhausted. A full inventory does not help if you cannot get back to breathe.
Rank #2
- Survival is key: gather valuable materials, craft tools, manage your hunger and thirst, all while evading the dangerous wildlife that sees you as its next meal
- the mysteries submerged on planet 4546b: you came here in search of answers. You risked everything to get here and you will not leave until you have uncovered the truth…
- exploration: Delve into unique Aquatic and terrain biomes that will unlock not only materials, but the answers that you seek
- build your habitat: crafting and building the comforts of home here. These bases will be integral for your survival from not only the wildlife, but also the harsh environment around you
Use a return-time rule
Before descending, decide what you are collecting and where you will turn around. Leave enough oxygen for the ascent and for finding the exit if the route is not a straight line. Begin heading home while the gauge still feels comfortable; waiting for the final warning turns a routine swim into a race.
Expect depth to increase the cost
Deeper water increases risk. Exploration guidance reports that oxygen is consumed faster below 100 m without a Rebreather, so the same tank that feels generous in the Safe Shallows can provide much less practical working time at depth. Treat depth as a resource cost: every additional metre reduces the margin available for searching, scanning and navigating back.
Keep routes simple
- Make short out-and-back loops rather than wandering until the return direction is unclear.
- Use the lifepod and the shape of the nearby terrain as visual references.
- In caves, identify the exit before moving deeper and avoid branching passages when your oxygen reserve is already reduced.
- Do not start a new scan or harvest action if it leaves too little time to reach open water.
Secure food, water and materials before travelling farther
Exploration can make you forget hunger and thirst until returning is difficult. Keep a reserve before leaving the Safe Shallows, especially when you intend to follow a signal or investigate a wreck. Food and water are not optional preparation in Survival mode; they determine whether you can remain out long enough to complete the task you started.
Rank #3
- Dive into a vast underwater world - sub Nautica's ocean range from shallow coral reefs to treacherous deep-sea trenches, lava fields, and bio-luminescent underwater rivers
- Scavenge, craft, and survive - after crash landing in your life pod, the clock is ticking to find water, food, and to develop equipment needed to explore as you collect resources from the ocean
- Construct underwater habitats - build Bases on the sea Floor, choosing layouts and components, and managing hull-integrity as depth and pressure Increase
- Unravel the mystery - signs abound that something is not right and you must Figure out what happened to this planet and what caused you to crash - can you find a way to make it Off the planet alive
- Disrupt the food Chain - lure and distract a threatening creature with a fresh fish, or simply swim as fast as you can to avoid gnashing jaws of roaming predators
Build a small reserve
Catch fish during ordinary resource runs instead of waiting until the hunger meter is urgent. Prepare enough food and water for the planned excursion plus an extra margin for an unexpected detour. Store surplus supplies at the lifepod so a failed or interrupted trip does not reset your preparation.
Gather with a purpose
Collect basic raw materials before committing to a longer route. Early materials support the Scanner, O₂ tank, Knife, Repair Tool and Fins; having them on hand prevents a promising discovery from becoming a forced retreat simply because one component is missing. Avoid filling every inventory slot with random items when you do not yet know what the next task requires.
Scan to turn exploration into progression
The Scanner is both a learning tool and a progression tool. Use it on unfamiliar flora and fauna, fragments and objects around wrecks. Scanning expands your understanding of the environment and unlocks blueprints, which in turn makes later trips safer and more capable.
Rank #4
- From the award-winning studio, Unknown Worlds Entertainment, presents the return to the world of 4546B with Subnautica Below Zero
- Survival Is Key: Gather valuable materials, craft tools, manage your hunger and thirst, all while evading the dangerous wildlife that sees you as its next meal
- The Mysteries Submerged on Planet 4546B: You came here in search of answers. You risked everything to get here and you will not leave until you have uncovered the truth
- Exploration: Delve into unique aquatic and terrain biomes that will unlock not only materials, but the answers that you seek
- Build Your Habitat: Crafting and building the comforts of home here. These bases will be integral for your survival from not only the wildlife, but also the harsh environment around you
Scan in manageable batches
Choose a few targets on each dive and return with the information you collected. This keeps scanning tied to the oxygen budget instead of encouraging a completionist search that carries you into deeper or confusing territory.
Prioritize fragments and wreck items
When you encounter a fragment or an unfamiliar wreck item, scan it before moving on. These discoveries can directly broaden the set of craftable equipment. You do not need to understand the entire story or map to benefit; a steady habit of scanning is enough to make future options appear.
Repair the lifepod and use signals without rushing the story
The lifepod is more than a starting landmark. Repair it with the Repair Tool so its systems can support continued exploration. Once it is functioning, radio signals and nearby points of interest provide a paced way to choose your next destination.
Best Value
- Dive into a vast underwater world - sub Nautica's ocean range from shallow coral reefs to treacherous deep-sea trenches, lava fields, and bio-luminescent underwater rivers
- Scavenge, craft, and survive - after crash landing in your life pod, the clock is ticking to find water, food, and to develop equipment needed to explore as you collect resources from the ocean
- Construct underwater habitats - build Bases on the sea Floor, choosing layouts and components, and managing hull-integrity as depth and pressure Increase
- Unravel the mystery - signs abound that something is not right and you must Figure out what happened to this planet and what caused you to crash - can you find a way to make it Off the planet alive
- Disrupt the food Chain - lure and distract a threatening creature with a fresh fish, or simply swim as fast as you can to avoid gnashing jaws of roaming predators
Follow a signal only after checking your supplies and oxygen margin. A signal is an invitation to investigate, not a command to cross unfamiliar terrain immediately. If the route looks too deep or complex for your current equipment, return to the pod, gather materials and improve your tools first. This keeps progression low-spoiler and prevents one ambitious trip from consuming all your food, water and reserve oxygen.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose locations by safety versus depth
For beginners, the central decision is whether the information or materials in a location justify the additional travel and oxygen cost. Use this comparison before leaving the pod.
Recommended Free Tools
| Location type | Advantages | Risks and preparation |
|---|---|---|
| Safe Shallows | Easy orientation, short surface access and low-cost resource loops | Limited reach; use it to learn routes, gather basics and practice scanning |
| Nearby points of interest | More objects and fragments to scan; supports early progression | Carry food, water and the tools needed for the specific task; keep a clear return route |
| Deeper water | Greater exploration potential and access to areas beyond the starter zone | Higher oxygen demand and navigation risk; deeper than 100 m consumes oxygen faster without a Rebreather |
| Caves or unfamiliar zones | Can contain concentrated discoveries and materials | Entrances are easy to lose; prepare before entering and turn back before oxygen becomes critical |
There is no requirement to push deeper every time you return to the lifepod. A shallow loop that supplies materials and scans new objects is productive because it improves your next attempt.
Prepare for caves and unfamiliar areas
Caves combine the two beginner hazards that are easiest to underestimate: distance from the surface and confusing navigation. Before entering, decide what you are trying to collect or scan, confirm that the relevant tool is equipped, and check food, water and oxygen. Identify the entrance as you move inward.
- Enter with a specific task. A focused collection or scanning run is easier to end safely than open-ended searching.
- Leave a navigation margin. Do not spend the reserve needed to retrace a winding route.
- Use the same exit. If you cannot confidently locate the way out, stop advancing and return while the route is still familiar.
- Upgrade before repeating a failure. If the depth or distance leaves no comfortable oxygen margin, improve capacity or mobility instead of attempting the identical trip.
Common beginner mistakes and how to recover
| Symptom | Likely cause | Recovery |
|---|---|---|
| You reach a target with almost no oxygen | The route was too long or you waited for the final warning | Abort the objective, ascend immediately and plan a shorter loop with an earlier turn-around point |
| You return hungry or dehydrated | Supplies were not prepared before exploration | Spend the next shallow run catching fish, making water and storing a reserve |
| You cannot craft the next useful tool | Materials were collected randomly rather than for a purpose | Use the lifepod as a staging point, gather basic resources and scan nearby objects for blueprint progress |
| You become lost near a wreck or cave | The lifepod or entrance was no longer visible | Stop exploring, retrace the last known route and use prominent terrain as a reference on the next attempt |
| Damaged equipment limits the next trip | The lifepod was not repaired after the initial emergency | Craft or equip the Repair Tool and restore the pod before extending your range |
| A deeper dive repeatedly ends in an emergency ascent | Depth is consuming oxygen faster than the current setup can support | Return to shallow work, gather materials and improve equipment before trying again |
A repeatable routine for your first hours
Once the initial route feels familiar, repeat this cycle whenever you are unsure what to do next:
- Check health, hunger, thirst and oxygen equipment at the lifepod.
- Choose one task: gather a needed material, scan a small group of objects, repair equipment or investigate a nearby signal.
- Pack food and water for that task, with a reserve.
- Make a short route and note the return path before descending.
- Scan unfamiliar targets and collect only what supports the current objective.
- Turn back while oxygen remains comfortable, not when the warning is already urgent.
- Return to the lifepod, store supplies, repair what is damaged and reassess before the next dive.
This rhythm keeps progression steady while limiting the consequences of mistakes. The Safe Shallows teach navigation, scanning and resource management; the Scanner and early tools convert those lessons into new blueprints and longer, safer trips. When a destination demands more depth, distance or preparation than you currently have, postponing it is a strategic choice rather than lost progress.
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