Rebreather Day 1® (RD1) is a system and method for rebreather diving from Lombardi Undersea LLC. The system was developed in 2017 and has undergone several hundreds of hours of field evaluations prior to finalizing production components and their methodology.
The fundamental RD1 components provide the building blocks for a simple shallow water oxygen-only rebreather. Its open architecture affords simple evolutions from O2CCR to SCR, to mixed-gas CCR, and for a variety of specialized configurations.
OEM components, subassemblies, and/or complete customized systems are available.