Navigate, survive, explore! Roam a vast underground ocean in a customised steamship. Trade with strange new lands. Battle sea monsters. Smuggle souls. Seduce your crew. Go mad and hallucinate lizards. You are the captain. It’s your call…

Cast off. Don't look back.

“Soon,” she says, and the piano music falters and stops. “We’ll go hungry, and then the end will come, for me but not for you.”

“We broke into the galley today and found appalling things: corpse-candles, graven images, and the mortal remains of Able Seaman Ayrton, rendered partially to stock. The wretched cook would only cackle: You liked him better salted…”

Auroral Megalops roam the waters – large enough to consume a pony with messy and clattering glee, or to pose a menace to ill-prepared ships.

“Oh yes” the University’s Maritime Liaison whispers breathily. “Oh yes. This is quite a tasty one. Let me explain it to you.” She (he?) explains, teeth glinting.

“We sighted Mt Nomad again today, still afloat but listing, her dark glass flanks scored and pitted from the cannon-fire in our previous encounter. This will be the last battle. This monster has harrowed the seas too long.”

Sunless Sea is currently in EARLY ACCESS. The game is playable, completable and features dozens of hours of gameplay, but more content is coming over the next few months. Early Access purchasers will also receive any extra areas or DLC we provide. See our progress page for roadmap and details!

Take to the dark waters

Welcome to the dark and hilarious Victorian-Gothic underworld of Fallen London, where every choice has a consequence, from the style of your hat to the price of your soul. Except this time around, the Unterzee is your oyster.

Choose your ship, name your captain, and leave the bustle of the docks for the wild and lightless depths of the Unterzee. Explore the uncharted reaches of the Neath, where the map changes every time you play, and every officer in your crew has their own story.

Explore and survive. Encounter a corsairs’ village in a forest of stalagmites, come face to face with the vicious war trimarans of the New Khanate or the golden agents of the Dawn Machine. Grow strong and wise and rich and feared. With luck and skill you may achieve your ambitions: find your father’s legacy, found a pirate princedom or sail beyond the Unterzee into the strangeness at time’s heart.

Build a fine crew

Find and recruit officers on your travels to add to your ship’s Iron, Veils, Hearts or Mirrors – but more importantly these perhaps unsavoury folks are treasure troves of stories. And Sunless Sea is nothing if not a game of stories.

Get to know your First Officer and she might share the co-ordinates of a secret smugglers’ cove stuffed with drowning-pearls. Feed your ship’s cat a moonish sprat and it may begin to glow in the dark. Invite your surgeon to dinner in your cabin and… well, who knows?

Keep your crew’s Hunger and Terror at bay, or face quarrels, despair, nightmares, madness, cannibalism and mutiny. Too much and you’ll lose everything.

Ships, monsters & the terrible darkness

The Unterzee is a realm of sombre beauty. It is always night – where that light off your starboard bow might be a friendly port or the glowing teeth of a Lovecraftian monstrosity. Turn up your lights to see farthest, or let them sink low to escape detection… or to become the hunter.

Like everything else in Sunless Sea, light has its cost. If you can see them, they can see you, and you’ll risk leaving yourself adrift at the mercy of the tideless black.

Improve and customise your ship as you prowess on the black waters improves. Begin with a Splinter-Salvo and Evasive Manoeuvres: aspire to the Rarefaction Cannon and the terrifying Unclear Bomb…


Explore a vast underground ocean in your customised steamship! A PC & Mac game in glorious 2D, Sunless Sea is a game of exploration, survival and loneliness set in the award-winning Victorian Gothic universe of Fallen London. Take to the helm and set sail for the unknown. Light and darkness are your greatest allies, but a stout set of cannon and a gunnery officer with a grudge will come in useful too.

Everything in Sunless Sea counts towards your personal story – a non-linear, choice-heavy, personalised experience. It’ll take dozens of games to explore all the sub-plots, grand arcs, alternatives, mysteries, relationships and romances in the game. Your character will die (or disappear, or lose her mind, or be hollowed out and filled with candle-wax and haunt a cliff-top chapel)… but their legacy may survive. You’ll build up your own story across generations of zailors who braved the Unterzee and lost – or won…

Our influences! FTL; Don’t Starve; Strange Adventures in Infinite Space; Sid Meier’s Pirates; Taipan; Elite; roguelikes; the Crimson Permanent Assurance; the Irish immrama myths.

Enter Sunless Sea

Sunless Sea is currently in EARLY ACCESS. The game is playable, completable and features dozens of hours of gameplay, but more content is coming over the next few months. Early Access purchasers will also receive any extra areas or DLC we provide. See our progress page for roadmap and details!

Latest news

Nov 27, 12:00am

A multi-faceted update: new stories, new gameplay and a feast of new artwork. This is V0.6.3.1751, currently available on Steam (Humble versions always come along a little later due to timezones). FEATURES Legacies have been re-designed. When you die, choose your relationship to the late captain. More control over what you receive to take into […]

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Oct 31, 12:00am

Carnelian is here, tweaked slightly from the roadmap, but replete with new content and improvements to combat: CONTENT Visit Saviour’s Rocks, seat of the Tree of Ages Guest content by Richard Cobbett, highly appropriate for some late-night, lights-off Halloween zailing: Saviour’s Rocks, home of the sorrow spiders. Richard is a UK-based freelance writer and journalist […]

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Installing Yosemite? Read this first!
Oct 27, 12:00am

Hi everyone. We just wanted to let you know about a potential issue for Sunless Sea mac players who are planning to install Apple’s latest OS Yosemite. Sunless Sea runs on the Unity engine, and While there have been no reported issues with running Unity games on Yosemite at this point, installing the OS involves […]

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