The Rebreathers ecosystem comprises a tightly coupled set of upstream, midstream, and downstream actors that collectively enable the design, production, distribution, and operation of closed‑circuit breathing systems. Upstream, specialty gas manufacturers and high‑precision sensor suppliers provide the raw materials and components required for scrubbers, oxygen sensors, and pressure regulators. Midstream participants—original equipment manufacturers, system integrators, and software developers—assemble these components into certified rebreather units and embed control algorithms. Downstream, distributors, training organizations, and end‑user segments such as commercial divers, scientific researchers, and military units acquire the finished systems and generate operational value. Value is captured through component margins, integration fees, service contracts, and usage‑based licensing, forming a classic value chain analysis for rebreathers.