The Ocean Remembers Everything

In a world beyond Earth, a calamity occurred that altered an alien ocean like no other before — an ocean where flesh touches steel, where evolution has created biomechanical hybrids, and where something ancient is awakening in the deepest depths.

You are a survivor in this new world. Explore, collect, craft, and construct your way through an ocean that does not want you to survive. But you are not alone. Something is watching you from the depths. Something that remembers.

Her name is Thalassa.

Key Features

• Explore an Alien Ocean

  Explore vast underwater worlds teeming with hidden caves, ancient ruins, and biomechanical flora and fauna unlike anything found on Earth.

• Tame the Untameable

  The sea creatures are not just any ordinary sea creatures. They are hybrids of both organic and mechanical life. You will learn to tame them, ride them, and live with them.

• Pilot Submarines & Vessels

  Discover the abandoned vehicles left behind by those who came before. Explore the depths in submarines, ships, and experimental craft.

• Craft, Build, Survive

  Harvest resources from the changed seabed. Craft equipment. Construct underwater bases. The sea is unforgiving, but it is also a source of power—if you know how to tap it.

• Uncover the Mystery

  Who was Dr. Mulane Shinoise? What was he creating in his secret laboratory? What was the true purpose of Thalassa? Follow the story or make your own way - the decision is yours.

• Play Alone or Together
  Immerse yourself in the depth alone or join forces with friends in a cooperative multiplayer mode.

• Next-Gen Visuals

  Built with Unity's HDRP, realistic water simulation, volumetric lighting, and atmosphere effects to create a believable alien ocean environment.

Early Access

I Thalassa is entering Early Access, which means you get to join us on a journey as we expand the game, add more content, and grow the world, vehicles, creatures, story, and more, based on your feedback.

Your discoveries are what will shape the future of Thalassa.

From the Depths

"The ocean keeps its secrets well. But secrets, like pressure, have a way of rising."

Dive into the unknown, face the biomechanical creatures of the depths, and maybe, just maybe, you'll learn what Thalassa really wants.