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 an 'open source' architecture for a simple shallow water oxygen-only rebreather which can easily evolve to mixed-gas. Systems are in use at major university dive programs, as well other professional applications. Components have been used in assemblies for diving, hyperbaric medicine, confined space, HAZMAT, and aerospace systems.
OEM components, subassemblies, and/or complete customized systems are available.