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Watch trailer on Steam ↗Undersea 8
Kaleido · Published by Kaleido
Mostly Positive — 73% positive (11 reviews) · 9 achievements
Last updated 28 Sept 2026
You are trapped in a dangerous undersea ruin. Let’s escape from the deep sea with observation and quick situational judgment.
DJCTQ 12
£4.99
Lowest price we've ever recorded
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£4.99
Price history
4 Sept 2026Lowest: £4.99 · Highest: £4.996 Oct 2026
Indie, Simulation · 2024 · More under £5 games
Navigate treacherous underwater ruins with observation and quick thinking in Undersea 8, an indie simulation by Kaleido set for release in 2024.
About this game
You have become part of a recruitment program for some shady company.
The plan was to enter an underwater ruin, explore it, and give a large prize to anyone who escaped.
Be sure to remember the instructions given by the company.
If you find any anomalies, descend.
If there are no anomalies, ascend.
If you reach sea level, you have escaped safely.
Explore underwater ruins to discover anomalies and decide whether to ascend or descend.
Some anomalies may attack you.
The game supports two difficulty levels: Classic (Easy) mode and Normal mode.
Left Shift: Thruster
Spacebar: Ascend
Left Ctrl: Descend
Left mouse button: Headlight
Right mouse button: Take photo
There are no sounds that could be a copyright issue.
We would appreciate it if you could write down the title of the game and a link to the Steam store.
The plan was to enter an underwater ruin, explore it, and give a large prize to anyone who escaped.
Be sure to remember the instructions given by the company.
If you find any anomalies, descend.
If there are no anomalies, ascend.
If you reach sea level, you have escaped safely.
Gameplay
This is a walking simulator genre game inspired by The Exit 8.Explore underwater ruins to discover anomalies and decide whether to ascend or descend.
Some anomalies may attack you.
The game supports two difficulty levels: Classic (Easy) mode and Normal mode.
- Classic mode: This is a basic mode where you have to find anomalies and escape. The difficulty level is low and you start out in classic mode.
- Normal mode: This mode increases the level of difficulty by adding oxygen management and photo taking functions. Unlocked upon clearing Classic Mode.
Controls
WASD: MoveLeft Shift: Thruster
Spacebar: Ascend
Left Ctrl: Descend
Left mouse button: Headlight
Right mouse button: Take photo
Streaming Guidelines
Anyone, regardless of whether they are an individual or a corporation, can broadcast without permission.There are no sounds that could be a copyright issue.
We would appreciate it if you could write down the title of the game and a link to the Steam store.
System Requirements
Will my PC run this? →Minimum
Minimum:
- Requires a 64-bit processor and operating system
- OS: Windows 10
- Processor: Intel(R) Core(TM) i5
- Memory: 8 GB RAM
- Graphics: Geforce GTX 800
- DirectX: Version 12
- Storage: 3 GB available space
Recommended
Recommended:
- Requires a 64-bit processor and operating system
- OS: Windows 10
- Processor: Intel(R) Core(TM) i5-6600 CPU
- Memory: 8 GB RAM
- Graphics: Geforce GTX 1060
- DirectX: Version 12
- Storage: 3 GB available space
Supported Languages
English, Japanese, Korean
Latest news
AnnouncementsOfficial
UNDERSEA 8 Major Updates
Improvements Game Graphics Volumetric fog has been applied to the levels. It appears in graphics quality 'High' or higher. Added settings options Added options for gamma, motion blur, and water ripples to the settings. If you feel motion sickness during the game, adjust or turn off these options. Improved presentation Some anomalies have been reworked to enhance the presentation. Lowered difficulty of the last level of normal mode Two checkpoints have been added to the last level of normal mode. Now, you can die without worry! Reworked Ending B Ending B has been reworked to enhance the presentation. Also, after completing the ending, players can clearly see that they have completed the ending. A retry function has been added after completing the ending. The retry button will restart from the last checkpoint, making it easier to see other endings.Read full article on Community Announcements (Kaleido)Patch NotesOfficial
Bug fixes and feature additions
Bug where all anormalies are reported Bug fix There was a bug where all anormalies were considered to have been found if you quit the game immediately after starting the game for the first time and then restarted the game, so this has been fixed. I'm sorry for the delay in finding the bug. Add features to main menu For those who have experienced the above bug, a 'Delete Reports' button has been added to the main menu. If you press the button, the record of anormalies discovered will be reset. If you have not encountered the above bug, you can ignore it. Balance adjustment Increased aggression of some anomalies The aggression of Krakens and Skeletons has increased significantly. Since it no longer crawls leisurely, it has become quite a menacing foe. Difficulty of last level of classic mode lowered The difficulty level has been lowered for those who are not familiar with the platform genre.Read full article on Community Announcements (Kaleido)AnnouncementsOfficial
Undersea 8 - Summer Vacation Discount
Because it overlaps with the launch discount, we were unable to participate in the summer season sale, but instead started the discount late. There is a 40% off sale for two weeks, so why not go on a vacation to the cool sea on a hot summer day?Read full article on Community Announcements (Kaleido)Patch NotesOfficial
1.0.6a minor update
Fixed a bug where the 'What the F...' achievement could not be obtained. We are truly sorry for the delay in discovering and fixing the bug.Read full article on Community Announcements (Kaleido)AnnouncementsOfficial
Improved convenience
Improved convenience Mark safe area At the starting point of each mode, a UI was displayed indicating that there were no anormalies. {STEAM_CLAN_IMAGE}/45022176/8bee007fe832dff232b18f3a8ed155baaa9979e8.jpg Added resupply function Oxygen is now resupplied when the depth is reset due to a misjudgment in normal mode. If the current amount of oxygen is less than the amount received at the start of the mode, it is automatically charged to 18%. If the amount of oxygen you have is higher than this, it will remain as is. Improved camera scanning method We have improved the function so that even if the anormalies deviates from the aiming point to some extent, the anormaly is considered to have been captured. {STEAM_CLAN_IMAGE}/45022176/dfd48494f94f60c9c64051a087e09ed587ed0f14.jpg New ending added Added new ending ‘Deepest Place’ and related achievements. Based on the judgment that it may be unpleasant to experience failure after a long chase in the last level, Added a new ending and made it possible to finish the game. Level structure modification Normal mode last level Added new stairs near the entrance. As a new ending is added, this staircase will take over the role played by the existing ‘last staircase’. Classic mode last level We added footrests to some sections to allow for a smoother climb. {STEAM_CLAN_IMAGE}/45022176/2badb5ec9163a3fec302e4e21e0b94833693323d.jpg Other Fixed a few typos.Read full article on Community Announcements (Kaleido)
