What'Sub is a 4-player co-op submarine extraction game where you pilot a rust-bucket submarine into the depths of the Bermuda Triangle to recover treasure from the ocean’s seafloor. Gear up, descent, risk everything to bring your haul back to the surface, then dive again to ever deeper levels.

Public builds
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Counted once we have watched for 90 days (since 21 Oct 2026)
Distinct builds deployed to a game's public (default) Steam branch, as Steam's client network describes them.
Checked within minutes of each Steam change. Observed since 21 Oct 2026.
Source: Steam client network (PICS), App info, public branch. Full methodology
Latest public build
Build 25035923
Update posts
7 postsPosts announcing an update, tagged or not
Posts in a game's official Steam news feed that announce an update: tagged as patch notes by the developer, or plainly about a patch or a released update.
Source: Steam Web API, ISteamNews/GetNewsForApp. Full methodology
Typical gap between builds
Not enough builds yet| Build | Went live | Patch notes |
|---|---|---|
| 25035923 | Hotfix 2026-08-31 |
From Steam’s client network, last checked . Builds before 21 Oct 2026, when we started watching, aren't listed. Patch notes are the developer’s update post from an hour before to a day after the build. Not every build gets one. How we count
| Posted | Update |
|---|---|
| 31 Aug 2026 | Hotfix 2026-08-31 Patch notes |
| 25 Aug 2026 | Bugfixes, Balancing, Oh My! Update |
| 14 Aug 2026 | Hotfix 2026-08-14 (part 2) Patch notes |
| 14 Aug 2026 | Hotfixes 2026-08-14 Patch notes |
| 26 Jun 2026 | First Update in a While! Update |
| 5 Jun 2026 |
| Changelog 2026-06-05 Patch notes |
| 1 Jun 2026 | Changelog, 01/06 Patch notes |
Steam keeps no record of past build numbers, so before 21 Oct 2026 a game’s update history comes from its own Steam news: posts tagged as patch notes, and untagged posts that plainly announce a patch or a released update. Older posts are still being read in, most played games first. How we count