Modular Cooperative Submarine — A New Vehicle Concept

I would love to see a new medium-sized submarine between the Tadpole and the Trident, with a focus on modularity and cooperative exploration.

Core concept

The submarine would consist of a cockpit and a single modular compartment. This compartment could be inspired by, or work similarly to, the modular compartments of the Seatruck from Subnautica: Below Zero.

Changing the compartment would require a special docking station at a base and the necessary resources, encouraging players to plan their expeditions and customize their vehicles before setting out.

The unique feature: connecting two submarines

Two submarines could dock together to form a larger vehicle, combining the capabilities of their respective compartments.

For example, two players could build different configurations, connect their submarines, and benefit from both at the same time. When they want to explore separate areas, they could simply undock and continue independently.

This would create interesting cooperative gameplay without making multiplayer mandatory. Solo players could also benefit by owning two differently configured submarines.

I believe this concept could fill the gap between the Tadpole and the Trident while introducing a unique vehicle identity, meaningful customization, and a new way to cooperate during underwater exploration.