English engineer Henry Fleuss developed the first commercially practical scuba rebreather in 1878. This self-contained underwater breathing apparatus recycled exhaled air, removing carbon dioxide and adding oxygen, allowing divers greater mobility and longer bottom times than surface-supplied systems.

Fleuss's rebreather, a marvel of miniaturization and chemical engineering, represented a leap toward the autonomous diver. This invention fueled the literary imagination, contributing to the genre of underwater adventure fiction that would culminate in Jules Verne's 'Twenty Thousand Leagues Under the Sea', and influencing poets who used the image of the self-contained diver as a symbol of individual freedom and the exploration of inner and outer depths.