Online co-op Underwater games

Every online co-op Underwater game on Steam we know of, newest first. Add tags or a price band to narrow it down.

Showing 11–20 of 53 games matching Underwater · updated 12 Oct 2026

Filters: Underwater × Clear all
$$
Released
Price
$$ · Standard
Players
👥 Up to 4 players
Reviews
92% of 150

Namako (Sea cucumbers) will save the Earth—NAMAKORIUM is a chaotic, cooperative multiplayer RTS game for up to four players. Command the “cleaners of the sea” —Namako left behind by humanity and work together to clean up the polluted oceans!

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
69% of 39

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.

If you loved these, you'll love this

Free
Released
Price
Free
Players
👥 Up to 6 players
Reviews
96% of 182

SHRIMP GAME: KRILL CONFIRMED is a solo or multiplayer third-person shooter RPG intro to SHRIMP GAME set in an abyssal realm. Pilot your SHRIMP platform to fight giant sea monsters, master elemental classes, and unearth secrets in a co-op campaign, or just krill your friends in multiplayer PVP!

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 2–4 players
Reviews
100% of 1

Catmarine is a 2-4 player co-operative, chaotic, typing game. Type to navigate through an ocean world with your cat submarine, the Catmarine! Use the various terminals inside of the Catmarine to maneuver it and to defend against oceanic dangers. Communicate, collaborate, and type as fast as you can!

If you loved these, you'll love this

$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
66% of 224

You survived a helicopter crash; going home is your top priority. Live as a castaway - survive the dangers of the islands by using your environment to find food, build shelter, craft tools to extend your stay, explore the secrets of the islands and their surrounding waters, and carve your way home.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
84% of 19

River Runners is a cooperative multiplayer adventure where you and your friends navigate a dangerous, unpredictable river. Clear communication and teamwork are essential to steer the raft, overcome hidden challenges, and survive the journey to the end.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
33% of 15

DEEPLY is an underwater adventure about treasure hunting, gear upgrading, and exploring a mysterious ocean. Dive off your raft, gather resources, discover artifacts, upgrade your equipment, and gradually get closer to the legendary ship your father devoted his life to.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 1–4 players
Reviews
77% of 995

Darkwater is a cooperative extraction horror game for 1-4 players. Command a submarine trapped under the ice of an alien planet. Battle enemy vessels and deep sea abominations as you hunt for resources. Do what it takes to survive.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Up to 5 players
Reviews
62% of 8

It's simple. Operate your submarine through challenging tight cave systems to collect the target, while not scratching the cave walls under suboptimal conditions. Navigate carefully and consider every move in this slow pace, athmospheric, multiplayer, submarine simulation-lite.

If you loved these, you'll love this