Scuba diver swimming towards SEALAB I habitat capsule, At Sea, 1964

Underwater footage shows a scuba diver swimming towards SEALAB I. A cage surrounds the capsule to keep out sharks, At Sea, 1964. SEALAB I, II, and III were experimental underwater habitats developed and deployed by the United States Navy during the 1960s to prove the viability of saturation diving and humans living in isolation for extended periods of time. The knowledge gained from the SEALAB expeditions helped advance the science of deep sea diving and rescue, and contributed to the understanding of the psychological and physiological strains humans can endure.