In late 2025, Unknown Worlds removed several older versions of Subnautica , including the early 2023 versions, from public Steam branches.
If you have encountered "Subnautica.v17.02.2023.zip" as a standalone download on a third-party site:
: This caused a "mod apocalypse" within the community, as many popular mods relied on these specific legacy versions to function. Subnautica.v17.02.2023.zip
: The removal was a response to a security flaw found in Unity engine versions used since 2017.
: While official branches were removed for safety, some users continue to use tools like DepotDownloader or the Steam console to manually retrieve these specific older manifests for mod compatibility. Safety and Legitimacy Warning In late 2025, Unknown Worlds removed several older
: One major milestone around this time was the release of a Switch 2 upgrade for the Switch version on February 17, 2023. The "Mod Apocalypse" and Security Removal
The file refers to a specific build of the underwater survival game Subnautica that was released on February 17, 2023 . While this date is nearly five years after the game's full release in 2018, it marks a significant period in the game's late-stage development history, primarily involving technical updates and compatibility fixes. The February 2023 Updates : While official branches were removed for safety,
: These updates typically focused on backend optimizations, such as depot changes for Win32 and macOS systems, rather than adding new gameplay content.