Independent Danish developer Khaos Games has announced that its chaotic underwater cooperative game What’Sub will launch on Steam Early Access on May 14, 2026, perfectly timed for Steam Ocean Fest. The game promises intense four-player underwater action where teamwork is not only useful, it is essential to survival.
What’Sub plunges up to four players into a ruined submarine with a simple but nerve-wracking objective: navigate hostile underwater depths, collect valuable cargo, and emerge alive. Each dive session lasts about ten minutes before a “shark storm” approaches, creating a natural pressure that forces crews to make split-second decisions between risk and reward.
The basic mechanics of the game revolve around waypoints where crews must decide whether to surface with their current transport or descend deeper for greater rewards. It’s a high-stakes gamble, because the destruction of a submarine means the loss of everything collected on that dive. However, successful runs provide gold for submarine upgrades, opening access to more difficult and lucrative biomes.
Developed by a team of six people following a game jam in Viborg last December, What’Sub emphasizes communication and coordination. “The only way to progress is to get closer to the other crew members by communicating,” explains game director Rasmus Kromand. Onboard dynamic systems ensure that things will break mid-dive, requiring constant attention from the crew to keep the sub operational.
What’Sub will be available on Steam Early Access starting May 14, 2026. Players can add the game to their wishlist on Steam to stay updated on development progress.
Frequently Asked Questions
On which platforms is What’Sub available?
What’Sub will launch in Steam Early Access on PC on May 14, 2026.
How many players can play What’Sub together?
What’Sub supports up to four players in online cooperative multiplayer, with the entire game built around crew coordination.
How long are What’Sub gaming sessions?
Each dive session lasts approximately ten minutes before a “shark storm” approaches, creating short but intense replayable experiences.
What happens if your submarine is destroyed in What’Sub?
If the submarine sinks during a dive, all goods and resources collected during that session are lost, making risk management crucial.
Can you upgrade your sub in What’Sub?
Yes, successful dives yield gold which can be spent to upgrade submarines, opening access to deeper, more dangerous biomes with greater rewards.
