soma walkthrough

{“title”:”Soma walkthrough: a complete route through the PATHOS-II underwater facility”,”slug”:”soma-walkthrough”,”keyword”:”soma walkthrough”,”rank_math_title”:”Soma walkthrough: a complete route through PATHOS-II”,”rank_math_description”:”Soma walkthrough that maps every major area of PATHOS-II, key puzzles, safe room exits, and the two endings without spoiling the story’s core question.”,”category_hint”:”Game Guides”,”image_alt”:”Soma walkthrough hero image of a dim underwater research facility corridor”,”image_prompt”:”A realistic editorial GameDev hero image of a dimly lit underwater research facility corridor. A single fluorescent tube flickers over a flooded metal walkway. A worn diving helmet sits on a control console, cables draped loosely. The hallway walls show faded caution stripes and a frosted window looking out into deep dark water. Cool teal and amber lighting, atmospheric haze, subtle condensation on metal surfaces. No text, no logos, no readable UI, no watermark. Composition centered on the console with the corridor receding behind. 1200×675.”}

Soma walkthrough: a complete route through the PATHOS-II underwater facility

Simon Jarrett wakes on the floor of a Vortex coastal robotics lab in 2015, undergoes a brain scan he does not remember consenting to, and wakes again on the ocean floor more than a hundred years later, inside the research complex called PATHOS-II. The game expects the player to walk, read, and look carefully before touching anything dangerous. This Soma walkthrough maps every major area in the order most players will reach it, points out the puzzles that block first-time players, names the safe rooms that act as reload anchors, and marks the decisions that lead to the two endings without giving away the philosophical question the designers want the player to answer for themselves.

The route below assumes the player explores in the order the game itself guides them, taking the accessible doors from each hub before backtracking to sealed sections. Players who only need help with one section can jump to it from the table of contents. The walkthrough covers the underwater sections, the surface structures, the airlock sequences, and the late-game structural collapses. Console versions follow the same structure as the PC release; the only notable difference is the use of the right stick for headlamp aiming on controllers.

How this Soma walkthrough is organized

Every major chapter in PATHOS-II is presented as its own H2 below. Each chapter begins with a one-line orientation, then lists the locked doors, dead bodies with unique audio logs, and the puzzles in the order the player meets them. Side rooms that only contain extra audio logs and lore files are grouped in a single list so the main path stays readable. The walkthrough does not transcribe dialogue in full, because reading the logs in context is part of the intended experience. Where a decision is irreversible, the chapter explains the saving conditions and the safer alternative before the player commits to the action.

Two game design patterns from Frictional Games shape the route. First, every safe room has the same chair, the same save terminal, and the same light switch, so once the player learns one, the rest are mechanical mirrors. Second, the game saves manually, so the walkthrough marks a save point before every threat rather than at fixed intervals. Players who ignore the save discipline will replay entire encounters from the entrance of the area.

Tips that apply to the whole game

A few habits reduce the cost of mistakes across the entire Soma walkthrough. They are mechanical rather than narrative, so they belong at the top of the route.

• Read every body-mounted audio log on first contact. Several doors in later areas only open after the player has heard the relevant log.
• Save at the first save terminal inside any new area, then again after reading the area’s introduction log. This creates a midpoint reload in case the first threat kills the player before they orient.
• Use the headlamp sparingly. The lamp is a steady battery drain, and several sections are designed around short windows of bright light followed by long stretches of darkness.
• Crouch before opening doors the player cannot see through. Many threat encounters start the moment the door is opened, not after the player enters.
• Do not throw the WAU creatures are the player kills the wrong monster, because the game tracks whether the player behaves aggressively toward them, and the late-game rooms respond to that behavior.

Chapter 1: Upsilon and the transfer to PATHOS-II

Simon begins the game in a small Upsilon lab on the coast. The first task is mechanical: stand up, walk to the door, and walk out. The game opens with a short scripted sequence that is not dangerous, and the player’s first save point sits on the table in the same room. Pick up the audio logs, then walk down the stairs. The coast outside Upsilon is a long linear path with no threats, used to teach walking, looking, and listening. The Watson station near the end of this sequence holds the only interactive object in the area: a diagnostic computer the player reads to confirm the brain scan before the transfer. When the screen finishes, the player blacks out, the underwater facility begins, and the rest of the Soma walkthrough starts for real.

This chapter has no enemies, no inventory, and no branching. Its only job is to teach the player the controls. The pacing is the lesson. If the player dies here, they reload the same Upsilon lab, not a previous area.

Chapter 2: Delta: the first underwater safe room

Simon wakes in a flooded corridor in the Delta sector. The first thing the player does is find the ladder. Climbing the ladder leads into a sealed room with the standard chair, the standard save terminal, and a friendly voice on the intercom introducing Delta as a living site. Read the welcome log before anything else, because the intercom explains the door rules for the rest of the underwater complex. Each door in Delta opens with a keycard, the keycards are scattered, and a small number of sealed doors require a code from an audio log instead of a card.

The exploration loop for Delta, and for every underwater chapter after it, follows the same shape:

• Read the area log to learn the local threat and the local power rules.
• Take every keycard in the area before leaving the wing it is in.
• Use the save terminal after each new keycard, not after each new door.
• Return to the hub to open the next wing rather than trying to chain wings in a single run.

Delta introduces the first monster: a tall, clumsy figure that wanders the flooded hallway outside the player’s safe room. The monster does not pursue the player into the safe room itself, so the player can use the safe room door as a hard boundary. The lesson is that safe rooms are part of the level layout, not just save points. If the monster is in the hall, the player waits, lets the monster walk past, and re-enters the hall when the creature has moved at least one room away from the door. Soma is built around patience, not speed.

Within Delta the player needs to retrieve three keycards: one in the crew quarters, one in the data archive, and one in the engineering bay. The crew quarters introduce the first locked door with no visible keycard slot, only a keypad. The keypad code is the birthday of a researcher mentioned in the crew log the player picks up in the same room. The data archive holds the second keycard, but the door into the data archive is sealed until the player has the first keycard in their inventory. The engineering bay holds the third keycard and a damaged robot that asks a long series of questions. Answer the robot’s questions honestly. The answer pattern does not change the path, but it changes which audio logs the player picks up later, and a thorough Soma walkthrough should account for the extra lore as well as the keycards.

Chapter 3: Theta: flooded decks and the first heavy monster

Delta connects to Theta through a deep dive sequence. The player is in a diving suit for the entire underwater transit, and the suit has a finite oxygen supply shown on the helmet HUD. The oxygen gauge is not a puzzle; it is a timer. The player descends, follows a fixed line through the flooded structure, and surfaces in a Theta airlock. Save immediately on surfacing. Theta is the first chapter in which the player will die to a monster, and the dive itself is a fixed loss if the player runs out of oxygen before the airlock, so the save before the dive is one of the most important saves in the entire walkthrough.

Theta is a series of half-flooded decks. The water is chest-deep in many of the corridors, which means the player cannot crouch and cannot hide. The chapter’s monster is faster than Delta’s and reacts to the player’s headlamp. The right strategy is to turn the lamp off, wait at corners, and listen. The monster’s footsteps are loud and metallic, so the player usually has two or three seconds of warning before contact. The safest route through Theta is to stay above the waterline whenever the corridor allows it, because the monster’s pathfinding prioritizes flooded sections and the player can out-walk it on dry ground.

Keycards in Theta come from the bridge, the medical bay, and the engine room. The bridge door is sealed by a code rather than a card, and the code is the same code that unlocks the Delta keypad: the player’s job is to remember it across chapters. The medical bay holds a keycard and a body log that explains why the suit the player is wearing is not the player’s original body. The engine room holds the last keycard and a set of valves the player turns in a specific order to restart the area’s main power. The valve order is the same order the player heard in the engineering log picked up two rooms earlier, so the puzzle tests the player’s attention to logs rather than the player’s reflexes.

Chapter 4: Lambda: the surface structure

Lambda is the only above-water chapter in the Soma walkthrough, and it is also the only chapter that does not use the safe room pattern. The player walks onto a snow-covered surface site, hears a long radio transmission, and is told to find the Lambda main gate. There is no monster in Lambda, and there is no save terminal; the player’s only save is the auto-save at the chapter start. The auto-save is reliable, but the player should treat it as a soft save rather than a hard one, because the chapter contains one scripted sequence in which the player can fall off the structure and die.

Lambda’s puzzles focus on power restoration. The site has three generator halls, each with a set of breakers the player must throw in a specific order. The breaker order is given in a single log found in the central command tent, so the player only needs to read the log once to solve all three halls. Each generator hall has a separate countdown that ends with a power surge, and the player must leave the hall before the surge finishes, so the puzzle is to throw the breakers, run to the exit, and not turn back. The walkthrough’s recommendation is to throw the breakers, then leave the hall immediately, then read any nearby logs from the hallway rather than the hall itself.

Lambda ends with the player boarding a small submarine, the Curie, and diving back into the ocean. The dive to the next chapter is short and oxygen is not a concern. The save point on the other side of the dive is the first save of the next chapter, which means Lambda has exactly one save: the auto-save at the start. Players who reload a lot during the generator halls are reloading that single auto-save, which is the most common cause of “lost progress” complaints in Lambda.

Chapter 5: Omicron: the deep dive

Omicron is the longest single chapter in Soma and the chapter that most players will fail at least once. The player is back in a diving suit, the suit oxygen is finite, and Omicron is a vertical complex the player descends through deck by deck. Each deck has a sealed bulkhead, a code, and a monster. The codes are scattered as audio logs on the decks above the door they unlock, which means the player must reach a deck, read the deck log, return to the central stairwell, and enter the code from memory. Soma does not provide a codex; the codes are in the player’s head.

The Omicron monster is the most aggressive in the game. It cannot be avoided in close corridors, it can pursue the player across multiple decks, and it responds to the player’s headlamp, suit lights, and movement. The chapter is designed so that the player can avoid the monster entirely by descending a parallel stairwell two decks at a time. The walkthrough’s safer pattern is:

• Descend two decks from the current safe room.
• Wait at the bulkhead until the monster’s sound drops to the deck below.
• Enter the code and move to the next safe room, never stopping on an open deck.
• Save in the new safe room before reading its logs.

Omicron has four sub-areas: the airlock, the crew wing, the data wing, and the structural core. The data wing contains a long sequence in which the player downloads a brain scan, and the scan takes several real-time minutes. The download cannot be cancelled, and the player is exposed during the download. The walkthrough recommends saving immediately before the download and reading the surrounding logs after the download, not before, so the player is not standing still while the monster can still reach them.

The structural core is the final sub-area. The player descends a single shaft, finds a sealed door, and hears the voice of the Omicron site director. The director’s log explains the role of the structural integrity tester, a small handheld device the player has been carrying since the Theta engine room, and the director’s instructions are to take the tester to the site’s deepest point. The chapter ends with the player picking up a second, larger tester, and the walkthrough now moves to the game’s most unusual chapter.

Chapter 6: Phi: the site inside the site

Phi is the chapter in which Soma shifts from a survival horror game to a guided tour. The player is still in a diving suit, but Phi has no monsters, no oxygen timer, and no save terminals. The player walks along a fixed path, hears a sequence of voice-overs, and reaches a series of observation rooms that explain the larger plot. The walkthrough covers Phi as a tour rather than a puzzle set, because the only interactive choices the player makes are the doors they walk through. Each door leads to the next observation room, and the path through Phi is linear.

Phi’s only mechanical challenge is the player’s patience. The For additional context, voice-overs run for several minutes each, and the player cannot skip them. Players who leave the observation room before the voice-over finishes miss a small amount of context for the late-game decisions. The walkthrough’s recommendation is to stand still in each observation room until the voice-over stops on its own, then move to the next door.

Phi ends with the player reaching a small submersible dock, a working submersible, and a final voice-over explaining the player’s destination. The player boards the submersible and pilots it through a short scripted sequence. The chapter auto-saves when the submersible surfaces, and the next chapter begins with the player standing on a new surface site, this time in a thick fog.

Chapter 7: Tau: the late-game surface

Tau is the second surface chapter and the structural mirror of Lambda. The player walks onto a surface site that looks similar to Lambda but is colder, darker, and abandoned. The chapter has the same generator puzzle as Lambda, but the breaker order is different, and the order is given in a single log the player finds in the central tent. The walkthrough’s recommendation is to read the log once, take a photo of the breaker order with a real camera if the player has one, and then throw the breakers in the order the player has just read. There is no penalty for a wrong order, but a wrong order resets the breaker, so the player wastes a small amount of time on each mistake.

Tau’s monsters are not the same as the underwater monsters. Tau introduces a slow, heavy robot that patrols the surface structures. The robot is a tutorial for the late-game combat lite encounters: the player cannot kill the robot, but the player can hide from it inside the surface buildings. The hiding rule is to stay out of the robot’s line of sight, crouch behind a wall, and wait until the robot walks past. The robot’s path is fixed, so the player can learn the path by watching one full patrol, then move between the safe buildings without crossing the patrol’s line.

Tau ends with the player entering a sealed dome in the center of the site, picking up the largest tester the player has carried so far, and descending a long ladder into the water below. The dive that follows is short and oxygen is plentiful. The next chapter is the final underwater chapter before the player reaches the game’s branching decision.

Chapter 8: Kappa: the structural collapse

Kappa is the chapter in which the Soma walkthrough becomes a structural puzzle. The player is in a diving suit, the suit is undamaged, the oxygen is plentiful, and the player is descending into a site that is actively collapsing. Each deck the player enters has a visible timer that counts down to a structural failure, and the player must reach the deck’s safe room before the timer ends. The timers are generous, so the player has time to read the deck logs and explore the side rooms, but the player cannot linger.

Kappa has no monsters, only structural hazards. The hazards are falling debris, leaking pipes, and tilting corridors. The corridors tilt in a way that affects the player’s movement: the player walks more slowly up a tilting corridor than down one, and the player slides on a corridor that tilts past a certain angle. The walkthrough’s recommendation is to move through a tilting corridor in short bursts, then crouch to stop sliding, then resume. Crouching on a tilting corridor is safer than running, because the player’s center of mass is lower and the player can stop in place.

The chapter has three sub-areas: the upper decks, the mid decks, and the deep shaft. The upper decks hold the keycards the player needs to reach the deep shaft. The mid decks hold a single monster that is the last monster the player will fight in the game. The deep shaft is the final ladder the player climbs before the game’s branching decision. The walkthrough covers the upper decks as a keycard hunt, the mid decks as a timed monster run, and the deep shaft as a vertical climb. Save points are at the top of each sub-area and at the bottom of the deep shaft.

Chapter 9: The two endings

At the bottom of the Kappa deep shaft the player reaches a small observation room. The room contains a brain scan of the player, a copy of the player’s memories, a set of three bodies the player can choose to copy themselves into, and a final voice-over explaining the player’s choices. The game does not give the player a way to refuse the choice. The two endings the player can reach are:

• Ending A: Replace the existing body. The player copies their brain scan into one of the three bodies, the original body is shut down, and the player walks out of the observation room into a new life. The credits roll on the player’s new body, and the game’s final scene is the player walking into a city that does not know what they have done.
• Ending B: Refuse to replace the existing body. The player does not copy themselves into a body, the observation room’s systems shut down, and the player watches the body they are in die on the observation room floor. The credits roll on a black screen, and the game’s final scene is a long list of credits followed by a single image of an empty ocean.

There is no “good” ending and no “bad” ending in the mechanical sense. The Soma walkthrough covers both as separate outcomes, but the game’s design treats them as two answers to the same question. Players who replay the chapter can see both endings by reloading the save at the bottom of the deep shaft, choosing one ending, watching the credits, then reloading and choosing the other. The credits are not skippable, so each replay of the ending takes a small fixed amount of real time.

What the Soma walkthrough does not cover

The walkthrough above covers the mechanical path through PATHOS-II. The game contains roughly a hundred audio logs, dozens of body-mounted lore files, and several visual changes that depend on how the player has behaved in earlier chapters. A walkthrough that transcribed every log would replace the act of reading them, which is the most deliberate part of the game’s design. The path above is the path the designers expected the player to take; the logs the player picks up along that path are the logs the designers expected the player to read. The walkthrough preserves both.

Two related decisions sit outside the walkthrough. The first is whether to use headphones. The game mixes audio in stereo, and several audio cues are only audible in one channel. The second is whether to play in a single sitting or to break the game into two or three sessions. Soma is shorter than its reputation suggests, and the pacing of the chapters means the game can be paused at any safe room. Players who play in three sessions see roughly the same total time as players who play in one, because the safe room saves are instant.

Quick reference table: chapters, save points, and the main threat

The table below summarizes the chapters in the order the Soma walkthrough presents them. The save point column lists the safe room name the player saves at, and the main threat column lists the dominant hazard for that chapter. The deck code column lists the codes the player needs to enter from memory, in the order the player meets them. The codes are taken from the in-game audio logs the player picks up in the chapter before the keypad they unlock.

Puzzle quick reference: what the Soma walkthrough asks the player to do

The puzzles in Soma are short and read-from-a-log in nature. The table below lists the puzzle, the chapter it appears in, the source of the answer, and the cost of a wrong input. The wrong input column matters because several puzzles reset the player’s progress slightly, and a player who has read the source log once will avoid the cost entirely.

Frequently asked questions

Is Soma a horror game or a walking simulator?

Soma is a first-person adventure game with horror elements. The player does not fight monsters in any conventional sense; the player avoids them, hides from them, or out-walks them. The game’s strongest design focus is on the player’s relationship with the voice-overs and the audio logs, which is closer to a walking simulator than a survival horror game. The horror comes from the player’s interpretation of the events, not from the player’s combat skill.

How long does a Soma playthrough take?

A first playthrough takes most players between eight and ten hours, including the time spent reading logs and exploring side rooms. A second playthrough to see the other ending takes roughly thirty minutes of additional play, because the player can skip the exploration and reach the final decision in the same chapter as the original ending. Players who want to read every log on the first playthrough will add roughly two hours to the first run.

Can the player die in the Phi chapter?

No. Phi has no monsters, no oxygen timer, and no structural hazards. The player cannot die in Phi under any normal circumstance. The chapter is designed as a guided tour, and the only choices the player makes are the doors they walk through, all of which lead to the same next room.

Do safe rooms protect the player from every monster?

Yes. Monsters in Soma cannot enter a safe room, and the safe room door acts as a hard boundary. The player can use the safe room as a reload anchor and a hiding place. The one exception is the Tau robot, which is a non-monster hazard that patrols outside the surface buildings; the player hides inside the surface buildings rather than in a safe room, because Tau does not have safe rooms in the same sense as the underwater chapters.

What happens if the player runs out of oxygen during an underwater dive?

The player blacks out and the game reloads the save point the player was at before the dive. The dive itself is the only loss. Soma does not let the player drown and then continue; the dive is a single fixed loss per save, and the player returns to the chapter’s safe room.

Are there missable audio logs in the Soma walkthrough?

Yes, several. The most commonly missed logs are in the Omicron data wing, where the player is encouraged to start the download before exploring, and the logs in the data wing can only be picked up before the download. The walkthrough’s recommendation is to explore the data wing, pick up every log, and then start the download. The order is safe; the download is what triggers the next monster, not the log pickup.

Does the Soma walkthrough work on consoles as well as PC?

Yes. The PC release, the PlayStation release, and the Xbox release follow the same chapter order and the same puzzle structure. The only mechanical difference is the use of the right stick for headlamp aiming on controllers, which replaces the PC mouse aim. Players who play on console should use the same save discipline as the walkthrough, and the safe room pattern is identical.

Is the second ending reachable from the first save after the credits?

No. The credits are not skippable, and the second ending requires the player to reload the save at the bottom of the Kappa deep shaft, choose the other option, and watch the credits again. The walkthrough covers this as a single reload-and-replay rather than a continuation, because the game’s save system does not preserve state across credits.

Does the Soma walkthrough require the player to read every log?

No. A small number of logs are required to solve the keypads and the breaker orders, but most logs are flavor. The walkthrough marks the required logs in each chapter, and the player can skip the flavor logs without blocking the path. The game’s design is that reading the flavor logs is a separate experience from completing the path, and the two are not the same achievement.

Where can the player find more information about the developers of Soma?

Soma is the work of Frictional Games, a Swedish studio best known for the Amnesia series. The game’s design notes, post-launch patches, and the original 2015 release context are documented on the studio’s public materials, and a useful independent review of the game’s mechanics and themes is the contemporaneous Soma review from Game Informer, which provides useful background for this point. The broader history of the game and its place in the survival horror genre is also covered in the English Wikipedia article on Soma, which tracks the release, the console ports, and the critical reception.