OneTank is an action, indie, and adventure game built around online co-op play for up to four players on PC. Four divers share a single portable oxygen tank while exploring underwater caves and ruins in search of treasure. Hoses link each diver to the tank, forcing constant coordination as the group moves through tight spaces and returns with collected items.
Gameplay
The core loop centers on exploration, collection, and safe return. Players navigate submerged environments filled with caves and ancient ruins while gathering valuables. The shared tank creates ongoing tension because every action that uses air reduces the supply available to the entire team. Only the designated carrier can monitor remaining oxygen, so that player must relay information while others focus on movement and discovery.
Communication carries a direct cost. Speaking through the connected microphones consumes extra oxygen from the common supply, and louder voices burn through it faster. This mechanic turns routine directions, calls for assistance, or casual arguments into meaningful decisions. Teams learn to balance necessary talk with silence to stretch their air as far as possible.
Carrying capacity and positioning add further layers. The tank bearer stays central while others scout ahead or handle heavy items. Connections must remain intact, which means staying relatively close together. Returning to the surface or extraction point becomes a separate challenge once the haul grows heavy and air runs low.
Game Modes
The game supports online co-op sessions for groups of two to four players. All participants work together in the same underwater setting, sharing the single tank and its limitations. No separate competitive or solo modes appear in the available details, keeping the focus on collaborative survival and teamwork.
Within co-op sessions, players decide how far to push each dive. Groups weigh the risk of further exploration against the safety of heading back with what they already hold. These choices shape every run without requiring separate playlists or rule sets.
Key Mechanics and Features
The hose system and tank carrier role define movement and awareness. Divers must watch their connections while navigating narrow passages and avoiding hazards. Stylized character models emphasize personality, which fits the frequent moments of friendly blame when air runs short.
Treasure collection serves as the main objective, but the return trip matters just as much. Valuable finds change how the group moves and communicates, turning simple retrieval into a test of resource management. The stylized art style keeps the focus on the divers and their interactions rather than photorealistic detail.
Is It Worth Playing?
OneTank suits players who enjoy short-session co-op experiences built around communication and shared resources. The oxygen and voice mechanics create natural tension and humor without complex systems or long tutorials. Groups that like working through problems together while occasionally arguing over small mistakes will find the loop engaging.
Because the game relies on proximity and voice input, it rewards consistent teams more than random matchmaking. Those who prefer independent play or large-scale multiplayer may find the four-player limit and constant coordination too restrictive. The title remains in active development with no public release date or review data available yet, so interested players should follow official channels for updates on launch timing and final features.
