Living Under the Sea: Experiment Intends to Explore Habitability for Humans

Human Underwater Living: A New Frontier for Research and Exploration

Human underwater living, once considered a mere science fiction dream, is now becoming a reality. Companies like Deep, a British ocean technology and exploration firm, are developing habitats for extended underwater stays, aiming to establish a permanent underwater presence by 2027.

Valeri Polyakov holds the record for the longest space station stay with 437 days aboard Russia's Mir space station. Now, new technology is making longer-duration stays underwater possible. Proposed underwater habitats include the Aquarius Reef Base, a research facility off the coast of Florida, and the Sentinel, a 16m capsule developed by Deep for longer-term stays, including living spaces, bedrooms, and research facilities.

The Sentinel habitat is designed to house researchers at depths of up to 200m for 28 days at a time. This new habitat could revolutionize our understanding of the deep ocean and the effects of living underwater. Deep plans to closely monitor researchers at Sentinel during their stay to better understand the long-term physical and psychological ramifications of deep-sea living.

Extended underwater living in humans, as observed in studies like those by Prof. Joseph Dituri and Rudiger Koch, shows both significant physical and psychological effects.

Physical effects include notable biological changes such as a reduction in markers of inflammation and apparent "rejuvenation" at the cellular level. For example, Dr. Joseph Dituri, who lived underwater for 100 days, reported longer telomeres—chromosome structures linked to aging—resulting in a decrease of his biological age by about 10 years after the experiment. Blood tests indicated a 50% reduction in inflammatory markers, suggesting positive systemic changes likely due to the unique underwater environment and pressure.

Psychological effects are less specifically detailed in the available results, but individuals underwater long-term must adapt to isolation, altered light exposure, limited mobility, and confined habitats. Dituri was able to teach schoolchildren online during his stay, indicating he maintained cognitive function and some social interaction, which may mitigate psychological stress. Historical underwater habitats used for research and habitation (such as the Sentinel system) support stays up to nearly a month and emphasize the need to reduce risks like decompression sickness, which can also impact psychological well-being.

Other effects of underwater living include exposure to extreme pressure and altered oxygen environments, requiring saturation diving techniques to avoid decompression sickness and related neurological or physiological impacts. The underwater habitat environment often limits sunlight exposure, potentially affecting circadian rhythms and psychological health, though specific studies on this for extended stays are limited. Microbiological discoveries indicate that such environments can expose inhabitants to novel microorganisms, possibly influencing health in unknown ways, as Dituri’s team discovered a novel species underwater.

In summary, extended underwater living can induce remarkable positive changes physically, such as reduced inflammation and cellular "rejuvenation," as demonstrated in Prof. Dituri's experiment, while psychological effects are less documented but likely involve adaptation to isolation and environmental stresses. Controlled underwater habitats with attention to pressure and oxygen management are crucial for safely sustaining human life over long durations.

Rudiger Koch spent 120 days living in a capsule submerged 11m beneath the surface of the Caribbean Sea with no reported health concerns. The risk of decompression sickness (DCS, also known as 'the bends') is a concern for deep-sea divers. Deep aims to minimize the risk of DCS by keeping researchers in the Sentinel 'saturated', a state where the body has absorbed all of the dissolved gases it would at a particular pressure.

Astronauts have lived for extended periods aboard the International Space Station (ISS). Now, humans are looking towards establishing colonies at the bottom of the ocean, a largely unknown location. Dr Dawn Kernagis, the director of scientific research at Deep, has been published in various scientific journals, including the Journal of Clinical Oncology, Proceedings of the National Academy of Science, and Circulation. Her work could pave the way for a new era of underwater exploration and research.

Deep's goal is to allow researchers to spend longer living underwater to study the ocean floor and the effects of living underwater. With the Sentinel habitat and other projects in development, the future of underwater living is looking brighter than ever.

The advancements in technology are enabling longer-duration underwater stays, as seen in the Sentinel habitat developed by Deep for stays up to 28 days, shifting our research focus to the deep ocean and its effects on living underwater.
New findings show that underwater living can lead to physical benefits such as reduced inflammation and cellular "rejuvenation", as demonstrated by Dr. Joseph Dituri, who reported longer telomeres after a 100-day underwater experiment, suggesting a decrease in his biological age.
Adapting to isolation, altered light exposure, limited mobility, and confined habitats are some of the psychological effects experienced by humans living underwater for extended periods, such as the 120-day stay of Rudiger Koch 11m beneath the surface of the Caribbean Sea with no reported health concerns.
Scientists like Dr. Dawn Kernagis, the director of scientific research at Deep, are conducting research to better understand the long-term effects on physical and psychological health in underwater habitats, potentially paving the way for a new era of underwater exploration and research.
The emergence of underwater living could have profound implications for future space missions, as knowledge gained through underwater research can help prepare astronauts for life in space, such as managing pressure and oxygen environments and adapting to isolation.
With the development of projects like the Sentinel habitat and other underwater living facilities, science, technology, and the future of underwater living are poised to make significant contributions to space-and-astronomy, health, environment, nature, and our overall understanding of the universe.