Expedition 1: RMI Bikini Atoll

Expedition 1: RMI Bikini Atoll

• the environment

  Between 1946 and 1958, Bikini Atoll was the site of 23 nuclear weapons tests conducted by the United States government. The cumulative fallout produced one of the most radiation-impacted marine and terrestrial ecosystems on Earth, and one of the most consequential and least studied natural experiments in biological resilience.

  Decades after testing ended, microbial communities continue to persist across the atoll’s marine and terrestrial environments. They have not merely survived. They have adapted, developing biological mechanisms for radiation resistance, DNA repair, oxidative stress management, and cellular survival under conditions that no laboratory protocol has replicated at this scale or duration.

  These organisms represent a living archive of sustained adaptation to chronic ionizing radiation. Understanding how they function is not a historical or environmental question. It is a biomedical one.

  

  

• the science

  Expedition 1 RMI Bikini Atoll (E.1) applies high-resolution multi-omics profiling to extremophile populations across the atoll’s environments. The research centers on identifying and characterizing the biological mechanisms underlying radiation resistance. Leveraging techniques previously used by Dr. Scott Tighe through the Extreme Microbiome Project, we are deploying the first-ever nanopore methylation sequencing of metagenomes of atomic blast sites. E.1 will spend two weeks in the Marshall Islands, where the United States conducted 67 nuclear tests between 1946-1958. The centerpiece of our efforts will be Bikini Atoll, location of Castle Bravo, the largest thermonuclear test ever conducted in U.S. history. Our goal is to discover genetic adaptations to severe radiation exposure in regional lifeforms.  

  Scientific objectives:

  • Identify and characterize microbial extremophiles across irradiated marine and terrestrial environments

  • Perform multi-omics profiling to map genomic, transcriptomic, proteomic, and metabolomic signatures of radiation adaptation

  • Discover novel genes and pathways involved in radiation resistance, DNA repair fidelity, and cellular survival

  • Develop computational models of biological survivability under radiation regimes analogous to deep space, including galactic cosmic radiation and solar particle events

  

  

• Translational applications

  The findings from this expedition are designed to move from characterization to implementation. A primary application is astronaut radiation protection: understanding the molecular strategies that enable life to persist under chronic ionizing radiation is foundational to developing countermeasures for crews on long-duration deep-space missions. Radiation is one of the most significant unresolved risks in human spaceflight, and reducing that risk also expands what is scientifically possible aboard those missions, enabling more stable conditions for the biomedical experiments that generate insights applicable to health on Earth.

  Beyond spaceflight, potential applications include engineered microbial systems for biomanufacturing, biologically derived radioprotective compounds, and genomic targets relevant to cancer radiotherapy and radiation exposure response.

  In addition to the extremophile research, multi-omics samples are collected from the expedition’s dive team. Sustained exposure to an operationally demanding environment over extended dives mirrors many of the physiological demands of spaceflight, making the dive team a meaningful comparison population across our human spaceflight datasets. These human data integrate into the HERO platform, contributing new operational data to BioAstra’s longitudinal biomedical research infrastructure.

  

  

• ethics and community

  Bikini Atoll’s scientific significance cannot be separated from its human history. The nuclear testing program that created this environment displaced the Marshallese people from their ancestral home and caused lasting health, environmental, and generational harm, harm that continues today.

  BioAstra and the XX500 Board leaders approached this expedition with an explicit commitment to ethical accountability. All research is conducted in full compliance with the Nagoya Protocol on Access to Genetic Resources and the Fair and Equitable Sharing of Benefits, the international framework governing how genetic material from biodiversity-rich environments is accessed, used, and shared. Bikinians and residents of the Republic of the Marshall Islands are recognized as beneficiaries of the research, with formal commitments covering property rights, intellectual property transfer, and equity participation in any commercial entities derived from expedition findings.

  This expedition does not involve any human research, testing, or biospecimen collection from Bikinians or residents of the Republic of the Marshall Islands. The only human samples collected as part of this program come from members of BioAstra’s own expedition and dive team, to study the biological impact of their engagement in an extreme operational environment.

  Our community engagement framework also includes ongoing consultation with Marshallese stakeholders, data sovereignty principles that respect the rights of affected communities, and a commitment to storytelling that honors that history rather than bypassing it. We are committed to creating opportunities for local student participation and educational investment as part of this work.