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Hydra - Poseidon's conspiracy

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Hydra - Poseidon's conspiracy Trailer trailerWatch trailer on Steam ↗

Hydra - Poseidon's conspiracy

FM Simple Games Studio, Acid Arrow Studio · Published by FM Simple Games Studio, Sons of Welder

Content notice: The game depicts scenes of suicide, homicides occur, madness and insanity. It also depicts the use of drugs and other stimulants, and brutality. It has frightening scenes and a dark plot. There are also plot references to prostitution with images of women in underwear.

Positive — 94% positive (16 reviews) · 16 achievements

Last updated 28 Sept 2026

An agent probing a Third Reich bunker on a desolate island faces a survival horror nightmare. Battle deep-sea monsters in FPS or TPP camera mode. Forge your fate with 5 unique endings in a chilling descent into cosmic dread.

DJCTQ 16Full Controller Support

£7.49

Lowest price we've ever recorded

View on Steam

Prices can lag the live Steam store — always confirm before buying.

Price history

4 Sept 2026Lowest: £7.49 · Highest: £7.496 Oct 2026

Action, Adventure, Simulation · 2025 · More £5 - £15 games

Explore the depths of a Third Reich bunker on a desolate island in Hydra - Poseidon's conspiracy. Developed by FM Simple Games Studio and Acid Arrow Studio, this action-adventure-simulation game offers survival horror with both FPS and TPP camera modes, promising a descent into cosmic dread.

About this game

Gameplay:
- Investigate eerie clues and solve puzzles to uncover the bunker’s dark past.
- Battle otherworldly creatures rising from ocean depths.
- Scavenge resources to endure unrelenting horrors.

Features:
- Dual perspectives: Toggle between FPS and TPP anytime.
- 5 unique endings: Your decisions define the outcome.
- Immersive audio: Haunting soundscapes amplify the terror.
- Retro-modern fusion.
- Mental health system.

You have been sent to the island of Kanaan to find an abandoned research facility of the "Third Reich".

During the briefing, you received information that the facility was engaged in researching parallel dimensions and collecting information about ancient deities.

There are various legends about the island of Kanaan, some say that it was once inhabited by a tribe worshiping ancient sea deities. Others claim that the control over the island belonged to the fish people.

Four months earlier, tectonic tremors occurred throughout the archipelago, as a result of which tsunami waves rolled through the islands, but by some coincidence they missed Kanaan, but many of the buildings were damaged or collapsed.

Hydra is a detective game with survival horror elements. The main character's condition is described by three parameters: health, endurance and sanity. The player's task during the adventure is to keep these parameters at a decent level. Seth's character can die from the damage dealt, but he can also fall into madness. Endurance describes how long our character can run, parry blows or attack with melee weapons.

The player can use two different perspectives. From an isometric perspective, the hero can fight in contact using a melee weapon and also parry opponents' attacks. In first-person mode, we see what Seth sees through his eye implants. Seth was injured and lost his eyesight during one of his missions for the NML corporation. The corporation was "gracious" enough to provide him with the cheapest eye implants so that he could continue working for them. The implants have a night vision and environmental analysis mode that can mark useful elements of the environment.

During the investigation, we will find various useful items such as weapons, notes, food, medicines and utility items related to our task.

On our way, we will also encounter characters who may be able to provide us with helpful information or will be unfavorable towards us. The island of Kanaan is also a place where terrifying creatures come out of the dark sea.

The game has five ending variants, depending on the player's actions.

System Requirements

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Minimum

Minimum:
  • OS: Windows 10
  • Processor: AMD Ryzen 5 1600 / Intel Core i5 3470 @ 3.2 GHz
  • Memory: 4 GB RAM
  • Graphics: GTX 750 Ti
  • Storage: 1 GB available space

Recommended

Recommended:
  • OS: Windows 10+
  • Processor: AMD Ryzen 5 1600 / Intel Core i5 3470 @ 3.2 GHz ++
  • Memory: 8 GB RAM
  • Graphics: GTX 950
  • Storage: 1 GB available space

Supported Languages

English, Polish

Latest news

  • AnnouncementsOfficial

    Special discounted bundle to celebrate the launch of Deep Sheol!

    To celebrate the release of my new game, Deep Sheol—featuring the new adventures of Agent Seth—I’ve prepared a special discounted bundle for you. Thank you all for being here with me!
    Read full article on Community Announcements (Acid Arrow Studio)
  • AnnouncementsOfficial

    Seth's 3rd adventure is out now in my new game, Deep Sheol!

    Deep Sheol blends retro FPS gameplay with survival horror. The game features inventory management, lightweight crafting, and a vital stats system split into Health, Endurance, and Sanity. I invite everyone to check out the game's Steam page: Best regards to everyone,Paul
    Read full article on Community Announcements (Acid Arrow Studio)
  • AnnouncementsOfficial

    Deep Sheol - new demo!

    Working non-stop on my new project "Deep Sheol" (Retro FPS Survival Horror). A new demo is out now, feel free to check it out and let me know what you think!
    Read full article on Community Announcements (Acid Arrow Studio)
  • AnnouncementsOfficial

    New Seth Vidius FPS Adventure: Deep Sheol Demo Out Now!

    https://store.steampowered.com/app/3998990/Deep_Sheol/ Attention fans of Seth Vidius! The next chapter of his epic journey is coming as a thrilling FPS! Dive into the action-packed demo of Deep Sheol and experience the universe you love in a whole new way. If you battled through the challenges of the previous two games, this one’s for you—grittier, darker, and more intense. Join Seth once again and uncover the mysteries of Deep Sheol! Try the demo now and share your feedback! Best regards, Paul.
    Read full article on Community Announcements (Acid Arrow Studio)
  • AnnouncementsOfficial

    Some new pictures from the current work on the bunker location.

    {STEAM_CLAN_IMAGE}/45080975/1159a8195577fadbe03542b4fa621dc72ddf53c6.png{STEAM_CLAN_IMAGE}/45080975/1f4af8c7b6946292b9e954eb10a1914cade5de3c.png {STEAM_CLAN_IMAGE}/45080975/b5f490c0204083f6d110ade421fec41c3c2b8cdd.png {STEAM_CLAN_IMAGE}/45080975/45a883be8704672b4796ed8638553754b600302d.png {STEAM_CLAN_IMAGE}/45080975/24040b18a1b586790654ad995ca28f0fdde09524.png {STEAM_CLAN_IMAGE}/45080975/28f96301326a44dad11fc5a19c6d32025bdc9267.png {STEAM_CLAN_IMAGE}/45080975/f77ee2d08bd8cf6d2f3eb58cd2100344a55f8402.png {STEAM_CLAN_IMAGE}/45080975/83cfafaf8bff9814219a54e667ce3b2bed209c39.png
    Read full article on Community Announcements (FM Simple Games Studio)

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