
Uncover the mystery of Thalassa, a first-person psychological drama set under the sea. Ill-fate has fallen on your former crew and friends and it’s up to you to find answers onboard the wreckage. Experience the melancholic underwater journey of human stories facing life and loss.
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About
Thalassa is a single player, first person psychological drama set in 1905. You play as Cam, a deep sea diver in a crew of adventurers and pioneers aboard Thalassa. As you prepare to raise a long-forgotten Spanish galleon from the ocean, what should be a great day for history takes a turn for the worst.
Upon needing to take some time to heal from the event, you discover Thalassa has met a mysterious and unfortunate end. Your former crew mates are gone, and you'll need to descend into the depths to board the ship once more. Alone in the ocean, with your diving support Bailey guiding you from the surface, it's up to you to piece together the clues left behind in the wreckage and discover what really happened in the final moments onboard the ship.
Immerse yourself in an atmospheric story of self-discovery and sorrow onboard Thalassa.

Discover a story that delves into the complexities of human emotions and interactions, and learn about the intricate relationships between your crew members. You'll uncover the personal struggles of each member of Thalassa's crew and how grief can be experienced in different ways. Loss takes its toll in many shapes and forms, while life marches on.

As the only diver left in the crew, it's up to you to return to Thalassa, now in its final resting place on the seabed. Navigate your way through the strange, but beautiful surroundings and discover the clues that will help you unravel the events leading up to the disaster.

Experience the calm and isolation of deep-sea exploration as you navigate through debris of the shipwreck. In order to continue exploring the ship, you'll have to find the right tools to help unblock the obstructions in your path.
Stats
All-time low is the lowest price we've recorded for this game since we started tracking it.
Languages: English*, French, Italian, German, Spanish - Spain, Japanese, Korean, Norwegian, Russian, Simplified Chinese, Traditional Chinese*languages with full audio support
Engagement
Hours played at review time, across 44 reviews with recorded playtime.
Reviews
Themes across 43 recent reviews and how positive each mention is. A keyword signal, not full sentiment analysis.
positive critical· bar length = how often the theme comes up
Reviews
I very much enjoyed this, even as someone who won't swim in the ocean even if i can see the bottom. The game is slower paced, but not in a bad way. The story has to be uncovered bit by bit - obvi bc investigation stuff - but it kept me engaged the entire time. The art style, animations, voice acting, music composition? all of it is amazing and well done. One of the biggest complaints I saw in the other comments/reviews is that... You can't run. I personally am okay with this because, logically, it makes sense. It makes sense that you cant run because: A. you're in a *heavy* dive suit and moving in water. B. Water is 800 times *more* dense than air which is why it's harder to move quickly through it in general - especially if you are vertical and thus have more drag C. Cam, the protag that we play as, is doing their best to NOT take any risks and the best way to do that is to move cautiously Overall, I'm giving this a 9/10 but only bc i personally dont like the ocean lol
Good story, great charecters
Great Game
I truly loved the in-depth story of this game and had a blast. It's been a while since I have been able to predict the outcome of a game's ending. To the developers, thank you so much for your hard work. I can see the care you.
Thalassa: The Edge of the Abyss took me to the depths of the ocean, searching through the ruins of a sunken ship to learn how the fate of it, and it’s inhabitants, came to be. From the beginning, the game does a great job at drawing you into it’s atmosphere, especially once you get underwater. The game is supposed to be set in 1905, and while it does a decent job capturing the era in some respects, there are plenty of areas where it falls short, with numerous historical inaccuracies and bad world design elements. The animations, like others have mentioned, are very slow. While I understand that this was likely designed to add to the underwater immersion, it does get annoying after awhile. I doubt speeding up the animations a little bit would piss anyone off. The story is good. It’s got a deeper meaning that isn’t very clear until the end. I did find the reason for the ship sinking to be anti-climactic, but it did add to the overarching narrative and meaning of the game. There were some interesting twists throughout the game, subplots that I wasn’t expecting to end the way they did. The characters were well written with fairly good voice acting. I’m also a fan of the clue solving system, I think it was well implemented and really adds to the detective-style gameplay experience. I’d classify this game as a narrative-driven walking sim, so if that’s not your thing, you may want to pass on this one. Overall, I enjoyed my time on the Thalassa. It’s a fairly short game, taking around 7 to 10 hours to complete. I did 100% of the mysteries and clocked just over 8 hours. I think the $20 price tag is fine for an indie title such as this, but I’d probably just wait for a sale at this point. Side note: One of the achievements (Nautical Nomad) is a little buggy. It resulted in me having to revert to an older save, and walk around areas I’m pretty sure I had already visited to get it to eventually pop.
This is a delightful game. I was very invested in the story. It is basically a walking sim, though, so if that's not your jam don't play it.
This game made me cry, in a healing way.
This is a rather engrossing game of mystery/investigation/exploration woven into a rather deep and somewhat emotional story regarding tragedy. The gameplay itself reasonably good, maybe curated/guided a wee bit too much, and the slowness of the movement is understandable given the environment but can be a little annoying at times. Overall very glad I bought and played this game...it's one of those games you'll think about for a while after you've finished it...
the game is a captivating narrative-driven exploration game that immediately draws you in with its atmospheric depth and emotional storytelling. Set in a beautifully realized underwater environment, the game excels at creating a sense of isolation and wonder Atmosphere & Environmental Storytelling: The art direction is simply stunning. As I explored the ocean floor and the remnants of the research station, I was struck by how the environment felt like more than just a setting—it felt like an entirely different, alien world. The deep sea is rendered with such care that it creates a truly otherworldly sense of discovery, making you feel like a stranger visiting a realm that was never meant for human eyes. Emotional Depth: The narrative is poignant, dealing with themes of grief and mystery in a way that feels grounded and sincere. It focuses heavily on the human element, which makes the isolation of the setting even more impactful.
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Trends
Modeled estimate over time, reconstructed from Steam's monthly review histogram.
Momentum
Pace estimated from the game's recent review growth (our daily snapshots) at its own sales-per-review ratio — a momentum signal, not booked sales.
Audience
Estimated from the language of this game's reviews — a proxy for where players are, not official Steam demographics.
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