What problem does it solve?
It solves the challenge of playing Subnautica 2 cooperatively by enabling synchronized multiplayer gameplay across multiple players, including shared world state, inventory, and base-building actions.
Core Features & Use Cases
- Deterministic session synchronization (DSS) to keep shared world state consistent and reduce conflicts between peers.
- Shared inventory with integrity verification using Merkle tree hashing to detect and reconcile desync.
- Co-op base building synchronization so structures placed by one player appear for others in real time.
- Host migration and session recovery to preserve progress and minimize disruption if the host disconnects.
- Cross-platform networking transport using WebRTC/NAT punch-through for wider joinability.
Use case examples:
- Organizing friends to explore, build bases, and manage resources together without item/world mismatch.
- Running a co-op session where one player hosts, then safely continuing if the host drops.
- Coordinating large collaborative builds where every placed component must match across clients.
Quick Start
Install BepInEx for Subnautica 2, copy the DeepSynergy plugin DLLs into the BepInEx/plugins directory, and configure BepInEx/config/synergy_profile.json before starting or joining a co-op session.
